![Matt Slocum Sen. Bob Casey, D-Pa., speaks to reporters after a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/4f6ab5cd3ea3433b8e47376792a8f170/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., speaks to reporters after a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., greets a supporter after speaking at a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/f1d616f3633540d98b0cafc1a30bce94/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., greets a supporter after speaking at a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., smiles during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/7ba3bdce46164759b440734cbc6e9fac/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., smiles during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/e8138f6ac82841278eb3a6656532c591/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/c8c4e35b52a9440598342c0442ae0211/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., right, speaks with Scranton, Pa., mayor Paige Cognetti before a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/65e41b39efa34d29a5f119146a31d03a/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., right, speaks with Scranton, Pa., mayor Paige Cognetti before a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/3773fec125114c2f8c9147fe5e79498d/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)
![Matt Slocum Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)](https://mapi.associatedpress.com/v2/items/2e5cdc4ed7af4602b4f77704600a9f65/preview/preview.jpg?s=680x&wm=false)
Sen. Bob Casey, D-Pa., speaks during a campaign event, Monday, July 1, 2024, in Scranton, Pa. (AP Photo/Matt Slocum)