Pennsylvania Senate candidate Dave McCormick waves after speaking with Republican presidential nominee former President Donald Trump at a campaign rally Sunday, Sept. 29, 2024, in Erie, Pa. (AP Photo/Matt Rourke)

Republican presidential nominee former President Donald Trump, left, listens as Dave McCormick, Republican candidate for U.S. Senate in Pennsylvania, shouts "fight, fight, fight" during a campaign rally at Ed Fry Arena in Indiana, Pa., Monday, Sept. 23, 2024. (AP Photo/Rebecca Droke)

Sen. Bob Casey, D-Pa., speaks before Democratic presidential nominee Vice President Kamala Harris arrives for a campaign event, Friday, Sept. 13, 2024, Wilkes-Barre, Pa. (AP Photo/Matt Rourke)

This combination of photos taken in Pennsylvania shows Sen. Bob Casey, D-Pa., left, at a campaign event, Sept. 13, 2024, in Wilkes-Barre, and David McCormick, the Republican nominee for Senate in Pennsylvania, at a campaign event, April 25, 2024, in Harrisburg. (AP Photo)

Sen. Bob Casey, D-Pa., speaks before Democratic presidential nominee Vice President Kamala Harris arrives for a campaign event, Friday, Sept. 13, 2024, Wilkes-Barre, Pa. (AP Photo/Matt Rourke)

A car passes signs supporting Democratic presidential nominee Vice President Kamala Harris and Sen. Bob Casey, D-Pa., in Butler, Friday, Sept. 27, 2024. (AP Photo/Matt Rourke)