Democratic Sen. Bob Casey of Pennsylvania is conceding his reelection bid to Republican David McCormick.

The recount underway in Pennsylvania’s U.S. Senate race marks the end of a chaotic post-election period that has become the latest example of how disputed election rules can expose weak points in a core function of American democracy.

Pennsylvania’s state Supreme Court is weighing in on a flashpoint amid ongoing vote counting in the U.S. Senate election between Democratic Sen. Bob Casey and Republican David McCormick.

Republicans are going to court in Pennsylvania amid vote counting in the U.S. Senate election between Democratic Sen. Bob Casey and Republican David McCormick, with the contest headed toward a state-mandated recount.

The U.S. Senate election in Pennsylvania between Democratic incumbent Sen. Bob Casey and Republican David McCormick is headed for a statewide recount, as counties continued Wednesday to sort through outstanding ballots and the campaigns jousted over which ones should count.

Republicans landed historic victories in Pennsylvania, winning the battleground state’s valuable presidential electoral votes, posting a two-seat gain in its U.S. House delegation and sweeping all four statewide offices on the ballot, including a U.S. Senate seat.

Republican David McCormick has won Pennsylvania’s pivotal U.S. Senate seat, beating three-term Democratic Sen. Bob Casey.

President Joe Biden delivered remarks to the nation in what was his first appearance on camera in the aftermath of Donald Trump’s decisive victory over Kamala Harris.

Republican David McCormick cut into Democratic Sen. Bob Casey’s support in Philadelphia and its populous suburbs and built leads in the more GOP-leaning parts of the state, foreclosing the incumbent’s pathway to victory when The Associated Press called the race on Thursday.

The Supreme Court has rejected an emergency appeal from Republicans that could have led to thousands of provisional ballots not being counted in Pennsylvania.

Democratic U.S. Sen. Bob Casey of Pennsylvania and Republican challenger David McCormick have held the first debate in their race for a swing-state seat.

The Republican challenger trying to flip the U.S. Senate seat in swing-state Pennsylvania says he'll press for U.S. military action in Mexico to target fentanyl trafficking networks.

Before he ran for the Senate in Pennsylvania, David McCormick was a big name on Wall Street as CEO of the world’s largest hedge fund.

A few short minutes into Donald Trump's campaign rally, shots rang out, at least five.

Pennsylvania Sen. Bob Casey says President Joe Biden is able to run a strong race and serve a second term in the Oval Office.

Abortion rights have found an unlikely champion in swing state Pennsylvania.

Pennsylvania is seeing lots of action targeting gaps in its vote-by-mail laws.

The student protest movement over the war in Gaza is roiling Senate contests in an election year when control of the chamber is at stake in November.

Democratic Sen. Bob Casey and Republican challenger David McCormick will face each other in Pennsylvania’s high-stakes U.S. Senate contest this fall.

Democratic U.S. Sen. Bob Casey and Republican David McCormick will be the only names on ballots for the office in Pennsylvania’s April primary after a ruling by the state’s highest court.

For Democrats trying to defend the White House and Senate majority, Democratic Sen. Bob Casey of Pennsylvania is emerging as the tip of the spear in trying to reframe the election-year narrative around inflation.

Since he became a force in Republican politics, Donald Trump has figured prominently in U.S. Senate races, shaping which GOP contenders get nominated.

A Republican running for the U.S. Senate in Pennsylvania is escalating criticism of Democrats over the Israel-Hamas war and has traveled to the Israel-Gaza border to make the case that the Biden administration hasn’t backed Israel strongly enough.

Republican David McCormick is entering Pennsylvania’s U.S. Senate race in his second bid for the office, this time to take on Democratic Sen. Bob Casey.

David McCormick plans to run for U.S. Senate for a second time in Pennsylvania.

Republicans trying to recapture the U.S. Senate majority have the candidate they want in Pennsylvania.

Former hedge fund CEO Dave McCormick often touts his deep connection to Pennsylvania as he lays the groundwork for another likely Senate run.

Pennsylvania Democratic Sen. Bob Casey’s campaign says he raised more than $4 million in the last three months — his best fundraising quarter ever.

A hard-right Pennsylvania state lawmaker says he will not challenge Democratic Sen. Bob Casey.

Democratic Sen. Bob Casey says he’ll seek a fourth term, bringing unmatched name recognition in Pennsylvania politics to his party’s defense of a seat in a presidential battleground state.

Donald Trump’s attacks on fellow Republican David McCormick contributed to the former hedge fund manager’s loss in Pennsylvania’s Senate primary in May.

Democrats celebrating a successful effort to keep control of the U.S. Senate this year will soon confront a 2024 campaign that could prove more challenging.

An “unauthorized, unvarnished” biography of billionaire hedge-fund manager Ray Dalio will be published next fall.

Pennsylvania Democrat John Fetterman struggled at times to explain his positions and spoke haltingly throughout a highly anticipated debate against Republican Dr. Mehmet Oz as they vie for a critical Senate seat.

More than halfway through a tumultuous primary season, voters have rendered verdicts in a number of contests, many of which featured candidates arguing they best represented a continuation of policies favored by former President Donald Trump.

The Supreme Court is allowing elections officials to count mail-in ballots in Pennsylvania that lack a handwritten date but were received in time.

Dr. Mehmet Oz has won Pennsylvania's Republican U.S. Senate primary after a dayslong recount.

Former hedge fund CEO David McCormick is conceding the Republican primary in Pennsylvania for U.S. Senate to celebrity heart surgeon Dr. Mehmet Oz. McCormick ended his campaign Friday night as he acknowledged an ongoing statewide recount wouldn’t give him enough votes to make up the deficit.

When Philadelphia’s election board prepared to count ballots last year that were mailed-in without the voter’s handwritten date, Republicans threatened impeachment.

The U.S. Supreme Court is temporarily blocking the counting of some mail-in ballots in Pennsylvania.

Recounting began Friday in the too-close-to-call Republican primary contest for U.S. Senate in Pennsylvania.

Pennsylvania’s top election official says the margin between the top two candidates in last week’s Republican primary for U.S. Senate is tight enough to trigger a recount.

Former hedge fund CEO David McCormick is going to Pennsylvania’s highest court in an eleventh-hour bid to help him close the gap in votes with celebrity heart surgeon Dr. Mehmet Oz in Pennsylvania’s neck-and-neck Republican primary for U.S. Senate.

David McCormick’s campaign is suing in a Pennsylvania court over his neck-and-neck Republican primary contest for the U.S. Senate against celebrity heart surgeon Dr. Mehmet Oz. McCormick is trying to ensure counties obey a brand-new federal appeals court decision.

Pennsylvania Lt. Gov. John Fetterman has been released from the hospital after a stay of more than a week following a stroke.

Pennsylvania’s Republican primary for an open U.S. Senate seat is too close to call and is likely headed for a statewide recount to decide the winner of the contest between heart surgeon-turned-TV celebrity Dr. Mehmet Oz and former hedge fund CEO David McCormick.

Vote counting in Pennsylvania’s Republican primary for U.S. Senate has dragged into a third day as Dr. Mehmet Oz and former hedge fund CEO David McCormick remain essentially tied with tens of thousands of ballots left to tally.

Counting of mailed ballots in Pennsylvania is drawing renewed scrutiny amid a too-close-to-call U.S. Senate primary between Republicans David McCormick and Dr. Mehmet Oz. Former President Donald Trump blasted the state’s elections procedures on social media, even though there are no indications of any wrongdoing with those ballots other than a printing error that was slowing the tally in one county.

Heart surgeon-turned-TV celebrity Dr. Mehmet Oz and former hedge fund CEO David McCormick are locked in a too-early-to-call race for the Republican nomination to fill an open Pennsylvania U.S. Senate seat.

Former President Donald Trump’s influence was enough to elevate his Senate candidate to victory in North Carolina on Tuesday.

Donald Trump’s choice for Pennsylvania governor has won his primary, and his Senate pick is locked in an exceedingly close contest as the former president works to expand his hold on the Republican Party.

The last full day of campaigning in Pennsylvania’s hotly contested primaries for governor and U.S. Senate is under way, with a top Senate candidate in the hospital and establishment Republicans trying to stave off victories by candidates they view as too toxic to win in the fall.

Republican Senate hopeful Mehmet Oz is stepping up his criticism of a far-right candidate in Pennsylvania who is gaining traction ahead of Tuesday’s primary election.

Sensing a threat in Pennsylvania’s U.S. Senate race, Donald Trump has issued a warning that surging Republican candidate Kathy Barnette would upend the GOP’s chances of holding the seat in November.

Several prominent conservative groups are lining up behind Pennsylvania Republican Senate candidate Kathy Barnette as an alternative to Mehmet Oz, the celebrity heart surgeon endorsed by former President Donald Trump.

University of Nebraska regent Jim Pillen has won the state’s crowded Republican primary race for governor over a candidate endorsed by Donald Trump.

Former President Donald Trump enters the next stretch of the midterm campaign emboldened by primary victories but facing new risks.

Mehmet Oz’s rivals in Pennsylvania’s Republican primary for U.S. Senate are escalating their attacks on the celebrity heart surgeon’s connections to his parents’ native country of Turkey, raising it as a possible national security issue.

What could be the final primary debate between Republicans running for Pennsylvania’s open U.S. Senate seat devolved into a string of attacks.

Voters across a dozen states are set to decide primary elections this month that will determine the people and priorities leading the GOP into the fall midterms and beyond.

Millionaire candidates and billionaire investors are harnessing their considerable personal wealth to try to win competitive Republican primaries for open U.S. Senate seats in Pennsylvania and Ohio.

Republicans hoping to emerge from crowded primaries this year have spent tens of thousands of dollars hiring operatives with ties to former President Donald Trump.

Dave McCormick earned more than $22 million last year as CEO of the world’s largest hedge fund — the job he quit to run for U.S. Senate in Pennsylvania.

Texas Sen. Ted Cruz is endorsing former Ohio Treasurer Josh Mandel in the heated Republican primary for the open U.S. Senate seat in the Midwestern battleground.

As CEO of the world’s largest hedge fund, David McCormick wore suits, lived on Connecticut’s ritzy Gold Coast and talked up bipartisanship.

Political observers say Republican candidates are using transgender people as a classic “wedge issue” as 2022 campaigns heat up.

Cash is pouring in to Pennsylvania’s hotly contested race for U.S. Senate as wealthy and well-connected candidates move in from out of state followed by millions of dollars.

Former President Donald Trump is holding off on making a new endorsement in Pennsylvania’s closely watched Republican primary for U.S. Senate.

Pennsylvania's high-stakes race for an open U.S. Senate seat is seeing candidates bringing big bank accounts and big-time connections from blue states.