![Alex Brandon FILE - Sen. Bob Casey, D-Pa., pauses while speaking with reporters after a closed-door caucus meeting at the Capitol, Sept. 28, 2023, in Washington. Abortion rights, suddenly a potent political force in the aftermath of the U.S. Supreme Court's decision to leave such matters to the states, have found an unlikely champion in swing-state Pennsylvania. Casey, who will appear on the November ballot beneath President Joe Biden as they both seek reelection, has begun doing something he's never done before: attacking an opponent over abortion rights. (AP Photo/Alex Brandon, File)](https://mapi.associatedpress.com/v2/items/3a2842da55ec44c19f57ffb45329f4cc/preview/preview.jpg?s=680x)
FILE - Sen. Bob Casey, D-Pa., pauses while speaking with reporters after a closed-door caucus meeting at the Capitol, Sept. 28, 2023, in Washington. Abortion rights, suddenly a potent political force in the aftermath of the U.S. Supreme Court's decision to leave such matters to the states, have found an unlikely champion in swing-state Pennsylvania. Casey, who will appear on the November ballot beneath President Joe Biden as they both seek reelection, has begun doing something he's never done before: attacking an opponent over abortion rights. (AP Photo/Alex Brandon, File)
![Marc Levy FILE - Sen. Bob Casey, D-Pa., smiles while speaking during an event at AFSCME Council 13 offices, March 14, 2024, in Harrisburg, Pa. Abortion rights, suddenly a potent political force in the aftermath of the U.S. Supreme Court's decision to leave such matters to the states, have found an unlikely champion in swing-state Pennsylvania. Casey, who will appear on the November ballot beneath President Joe Biden as they both seek reelection, has begun doing something he's never done before: attacking an opponent over abortion rights. (AP Photo/Marc Levy, File)](https://mapi.associatedpress.com/v2/items/19506efc9eeb45dea6e7fed642c8e78f/preview/preview.jpg?s=680x)
FILE - Sen. Bob Casey, D-Pa., smiles while speaking during an event at AFSCME Council 13 offices, March 14, 2024, in Harrisburg, Pa. Abortion rights, suddenly a potent political force in the aftermath of the U.S. Supreme Court's decision to leave such matters to the states, have found an unlikely champion in swing-state Pennsylvania. Casey, who will appear on the November ballot beneath President Joe Biden as they both seek reelection, has begun doing something he's never done before: attacking an opponent over abortion rights. (AP Photo/Marc Levy, File)