Pennsylvania House Speaker Joanna McClinton speaks during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Pennsylvania House Speaker Joanna McClinton is interviewed during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper smiles as he steps up to speak, speaks at a press conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Former U.S. Rep. Gabby Giffords speaks during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper speaks at a press conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Former U.S. Rep. Gabby Giffords speaks during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper speaks at a news conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Former U.S. Rep. Gabby Giffords speaks during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Former U.S. Rep. Gabby Giffords exits following a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper listens to one of the other speakers at a news conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
N.C. Governor Roy Cooper speaks at a news conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Pennsylvania House Speaker Joanna McClinton is interviewed during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Posters for Vice President Kamala Harris' campaign are taped to a podium during a campaign event on Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper claps as he speaks at a news conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
North Carolina Governor Roy Cooper, center, smiles as he talks with with supporters at a press conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Former U.S. Rep. Gabby Giffords exits following a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Former U.S. Rep. Gabby Giffords looks on during a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Pennsylvania House Speaker Joanna McClinton poses for a portrait following a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
N.C. Governor Roy Cooper applauds one of the other speakers at a press conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
N.C. Governor Roy Cooper speaks at a press conference, Thursday, July 25, 2024, in Raleigh, N.C. Cooper is one of the people being considered to be likely Democratic presidential candidate Vice President Kamala Harris' running mate. (AP Photo/Chris Seward)
Pennsylvania House Speaker Joanna McClinton arrives for a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Former U.S. Rep. Gabby Giffords exits following a campaign event for Vice President Kamala Harris, Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)
Leftover posters for Vice President Kamala Harris' campaign are surrounded by flowers during a campaign event on Thursday, July 25, 2024 in Philadelphia. (AP Photo/Joe Lamberti)