text:  This is CBS News on the Hour, sponsored by Progressive Insurance. I'm Monica Ricks. There is increasing doubt now about President Biden's candidacy following his disappointing debate performance. Our Jennifer DiPinto has the latest CBS News poll. An increasing number of voters don't think Joe Biden should be running for president. More than 7 in 10 don't think he should, including many Democrats. Nearly half in his own party don't think he should be the Democratic nominee.