HARRISBURG — Democratic Sen. Bob Casey and Republican challenger David McCormick will face each other in Pennsylvania's high-stakes U.S. Senate contest this fall, as Tuesday’s primary election put the men on track for a race that is expected to cost hundreds of millions of dollars and help decide control of the Senate next year.

Casey and McCormick won their respective party primary contests after they were uncontested and now enter what is likely to be a grueling, expensive and hard-fought 2024 general election campaign that culminates in the Nov. 5 vote.

Casey, seeking his fourth term, is perhaps Pennsylvania’s best-known politician and a stalwart of the presidential swing state's Democratic Party — the son of a former two-term governor and Pennsylvania’s longest-ever serving Democrat in the Senate.

McCormick is a two-time Senate challenger, a former hedge fund CEO and Pennsylvania native who spent $14 million of his own money in a narrow loss to celebrity heart surgeon Dr. Mehmet Oz in 2022's seven-way GOP primary for the U.S. Senate. Oz then lost to Democratic Sen. John Fetterman.

This time around, McCormick has consolidated the party around his candidacy and is backed by a super PAC that's already reported raising more than $20 million, much of it from securities-trading billionaires.

McCormick's candidacy is shaping up as the strongest challenge to Casey in his three reelection bids. McCormick has worked to shore up support in the GOP base, and on Tuesday night hammered his message at his election night gathering in Pittsburgh that Casey is a do-nothing senator.

“We’re now turning to the general election and here’s the truth: Pennsylvania deserves better than Bob Casey. You deserve better,” McCormick said. “Bob Casey's defining achievement in his political life, 30 years in political office, has been to be the son of Bob Casey Sr. That is what defines his political career.”

Casey, in Washington on Tuesday to cast votes in favor of $95 billion in war aid to Ukraine, Israel and Taiwan, said on social media that “there are 196 days until the general election, and we're going to win.” Meanwhile, the state Democratic Party unveiled a minute-long digital ad slamming McCormick as a “millionaire hedge fund executive who is lying to Pennsylvanians.”

In Butler County, Casey received 10,036 votes, or 79.72% of the votes, on the Democratic ballot, according to unofficial election results from the Butler County Bureau of Elections.

Meanwhile in Butler County, McCormick received 20,007 votes, or 90.89% of the votes, on the Republican ballot for Butler County, according to unofficial election results.

The Senate candidates will share a ticket with candidates for president in a state that is critical to whether Democrats can maintain control of the White House and the Senate.

President Joe Biden and former President Donald Trump won their party nominations easily after all major rivals dropped out. Both men made campaign trips to swing-state Pennsylvania in recent days, and voters can expect to see plenty of them, their TV ads and their surrogates campaigning over the next six months in a state that swung from Trump in 2016 to Biden in 2020.

In Butler County, Biden received 10,980 votes, or 87.07%, of the votes on the Democratic ballot, while Trump received 19,094 votes, or 83.2% of votes on the Republican ballot, according to unofficial election results from the Butler County Bureau of Elections.

On a statewide level, however, there could be a number of “uncommitted” write-in votes cast in the Democratic primary to protest Biden’s handling of the Israel-Hamas war.

In the Senate contest, Democrats have attacked McCormick's opposition to abortion rights, his frequent trips to Connecticut’s ritzy “Gold Coast” where he keeps a family home, and the focus on investing in China during his dozen years as an executive at the hedge fund Bridgewater Associates, including as CEO.

Casey has been a key player for Democrats trying to reframe the election-year narrative about the economy by attacking “greedflation” — a blunt term for corporations that jack up prices and rip off shoppers to maximize profits — as fast-rising prices over the past three years have opened a big soft spot in 2024 for Democrats. Recent indications that the U.S. economy avoided a recession amid efforts to manage inflation have yet to translate into voter enthusiasm for giving Biden a second term.

McCormick, meanwhile, has accused Casey of rubber-stamping harmful immigration, economic, energy and national security policies of Biden, and made a bid for Jewish voters by traveling to the Israel-Gaza border and arguing that Biden hasn’t backed Israel strongly enough in the Israel-Hamas war.

Casey is one of Biden’s strongest allies in Congress. The two men share a hometown of Scranton and their political stories are intertwined. Biden — who represented neighboring Delaware in the Senate and roots for Philadelphia sports teams — has effectively made Pennsylvania his political home as a presidential candidate. Long before that, Biden was nicknamed “Pennsylvania's third senator” by Democrats because he campaigned there so often.

McCormick and Trump have endorsed each other, but are an awkward duo atop the GOP's ticket. Trump savaged McCormick in 2022's primary in a successful bid to lift Oz to his primary win. And McCormick, for his part, has told of a private meeting in which he refused Trump's urging to say that the 2020 presidential election was stolen, a disproved claim the former president has never abandoned.

Still, Trump, speaking to reporters after arriving at the courthouse in New York for his criminal hush money trial, urged people to vote in Pennsylvania and gave a shoutout to McCormick.

“lt’s a big day in Pennsylvania. And we hope that people get out there and vote. It’s important to vote to let ’em know that we’re coming on November 5th; we’re coming big,” Trump said. “Maybe they’ll think also about a very good person who’s running for the Senate in Pennsylvania: Dave McCormick. And he’s doing a good job. He’s working very hard, successful man, wants to put his success to the country.”

Democrats currently hold a Senate majority by the narrowest of margins, but face a difficult 2024 Senate map that requires them to defend incumbents in the red states of Montana and Ohio and fight for open seats with new candidates in Michigan and West Virginia. A Casey loss could guarantee Republican control of the Senate.

Elsewhere on the ballot Tuesday, Pennsylvanians decided nominees for an open attorney general's office and two other statewide offices — treasurer and auditor general — plus all 17 of the state's U.S. House seats and 228 of the state's 253 legislative seats.

For attorney general, Republicans nominated Dave Sunday, York County’s district attorney, in a two-way race while Democrats nominated former state Auditor General Eugene DePasquale of Pittsburgh in a five-person primary field.

On the Republican ballot in Butler County, voters supported Sunday. Unofficial results indicate 14,167 votes, or 69.97% of the votes, went to him. His opponent, Craig Williams received only 5,987 votes, or 29.57% of the vote.

In Butler County, DePasquale received 8,774 votes, or 70.82% of the votes, on the Democratic ballot, according to unofficial results. Locally, his opponents Jack Stollsteimer received 1,176 votes, or 9.49%, Jared Solomon received 921 votes, or 7.43%, Joe Kahn received 793 votes, or 6.40%, and Keir Bradford-Grey received 683 votes, or 5.51%, according to unofficial election results from the Butler County Bureau of Elections.

On a state level, Democrats also nominated Erin McClelland, a two-time congressional candidate in suburban Pittsburgh who has helped run various human services organizations, to challenge Republican state Treasurer Stacy Garrity, and they nominated state Rep. Malcolm Kenyatta of Philadelphia to challenge Republican state Auditor General Tim DeFoor. McClelland prevailed despite being heavily outspent by her party-endorsed rival.

McClelland received 8,661 votes, or 71.43%, of the votes on the Democratic ballot in Butler County, according to unofficial election results from the Butler County Bureau of Elections. Her opponent, state Rep. Ryan Bizzarro, D-3rd, received 3,422 votes, or 28.22% of the votes.

Garrity received 19,873 votes, or 99.54% of the votes countywide on the Republican ballot, according to unofficial election results from the Butler County Bureau of Elections.

Countywide, Lehigh County Controller Mark Pinsley received 5,944 votes, or 51.93% of the votes on the Democratic ballot for the auditor general nomination, according to unofficial election results from the Butler County Bureau of Elections. His opponent, Kenyatta received 5,449 votes, or 47.6% of the votes.

In Butler County, Tim DeFoor received 19,592 votes, or 99.47% of the votes on the Republican ballot, according to unofficial election results from the Butler County Bureau of Elections.

For Congress, 44 candidates were on ballots, including all 17 incumbents. All three incumbents facing primary challengers — Republican Rep. Brian Fitzpatrick in suburban Philadelphia and Democratic Reps. Dwight Evans in Philadelphia and Summer Lee in a Pittsburgh-based district — won their primary races.

Lee’s primary against challenger Bhavini Patel has shaped up as an early test of whether Israel’s war with Gaza poses political threats to progressive Democrats in Congress who have criticized how it has been handled.

Republicans nominated state Rep. Ryan Mackenzie in a three-way race to challenge Democratic Rep. Susan Wild, whose Allentown-based district is politically divided, while Democrats nominated former TV news personality Janelle Stelson from among six candidates to challenge Republican Rep. Scott Perry of southern Pennsylvania.

Perry has become a national figure for heading up the ultra-right House Freedom Caucus during a speakership battle and his efforts to help Trump stay in power after losing the 2020 presidential election.