FILE - Democratic presidential nominee Vice President Kamala Harris and her running mate Minnesota Gov. Tim Walz arrive at a campaign rally in Philadelphia, Aug. 6, 2024. (AP Photo/Matt Rourke)

Democratic presidential nominee Vice President Kamala Harris and her running mate Minnesota Gov. Tim Walz arrive at a campaign rally in Philadelphia, Tuesday, Aug. 6, 2024. (AP Photo/Matt Rourke)

Republican vice presidential nominee Sen. JD Vance, R-Ohio, walks back from looking at Air Force Two at Chippewa Valley Regional Airport, Wednesday, Aug. 7, 2024, in Eau Claire, Wis. (AP Photo/Alex Brandon)

A supporter carries a sign before Democratic presidential nominee Vice President Kamala Harris speaks at a campaign rally, Saturday, Aug. 10, 2024, in Las Vegas. (AP Photo/Julia Nikhinson)

Attendees wait in line before a campaign rally with Democratic presidential nominee Vice President Kamala Harris at the University of Nevada, Las Vegas on Saturday, Aug. 10, 2024. (AP Photo/Jae Hong)