FILE - Rep. Brian Fitzpatrick, R-Pa., speaks at a news conference, Jan. 31, 2023, on Capitol Hill in Washington. Mark Houck's campaign to unseat Fitzpatrick in Pennsylvania's GOP primary could offer hints about swing-district party sentiment in a heated presidential election year. The congressional district in suburban Philadelphia is one of 16 nationwide that Democrat Joe Biden carried in 2020 where voters also sent Republicans to Washington. The Republicans' House majority is so slim that Democrats need to flip just four seats to retake control. (AP Photo/Jacquelyn Martin, File)