 Live from NPR News in Washington, I'm Giles Snyder. President Biden is due in the Hamptons this afternoon. He's to headline a couple of campaign fundraisers in New York and another in New Jersey this evening as top Democrats close ranks around him following Thursday's debate. And with former President Trump facing fitness questions of his own, NPR's Stephen Fowler reports on a group that could help determine the outcome in a close election this November.