 President Joe Biden urged his supporters to stay unified during a series of Sunday stops in critical Pennsylvania, even as some leading congressional Democrats privately suggested it was time for him to abandon his reelection bid because of intensifying questions about whether he's fit for another term. It followed his weekend interview with ABC's George Stephanopoulos, intended to be a bounce-back performance for Biden. Are you sure you're being honest with yourself when you say you have the mental and physical capacity to serve another four years?