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FILE - Sen. Bob Casey, D-Pa., speaks during the Democratic National Convention, Aug. 22, 2024, in Chicago. (AP Photo/Paul Sancya, File)

FILE - Sen. Bob Casey, D-Pa., speaks during the Democratic National Convention, Aug. 22, 2024, in Chicago. (AP Photo/Paul Sancya, File)

FILE - David McCormick, the Republican nominee for U.S. Senate in Pennsylvania, pauses during a speech at a campaign event at the Beerded Goat Brewing Co. in Harrisburg, Pa., April 25, 2024. (AP Photo/Marc Levy, File)

FILE - David McCormick, the Republican nominee for U.S. Senate in Pennsylvania, pauses during a speech at a campaign event at the Beerded Goat Brewing Co. in Harrisburg, Pa., April 25, 2024. (AP Photo/Marc Levy, File)