Incumbent: Republican Pat Toomey (retiring)
The Democratic field in this top pick-up opportunity got a new candidate last week, when Rep. Conor Lamb made official his campaign to replace Toomey. The Marine veteran and former prosecutor, whom Biden once said "reminds me of my son Beau," joins Lt. Gov. John Fetterman -- the biggest fundraiser in the race -- Montgomery County Commissioner Val Arkoosh, who has the backing of EMILY's List, and state Rep. Malcolm Kenyatta as the major candidates trying to flip this seat blue. Lamb first came to Congress in a 2018 special election, winning a conservative district that Trump had carried comfortably two years earlier. Like Fetterman, he's from the western part of the state, but unlike the former Braddock mayor, Lamb has tried to cut a more moderate image, which could be advantageous in a general election. Republicans haven't yet coalesced around a candidate of their own, but they're gleeful that a competitive Democratic primary may be pushing all their potential opponents to the left. Lamb, for example, has come out in support of ending the filibuster. Meanwhile, Republicans Jeff Bartos, a businessman, and Army veteran Sean Parnell, who lost a House race to Lamb in 2020, continue to duke it out, while Carla Sands, Trump's ambassador to Denmark and a top donor, announced her candidacy late last month. Former congressional candidate Kathy Barnette, who hadn't gotten much attention in the race so far, generated some buzz by outraising the other GOP contenders in the second quarter.