 according to a new poll sharply undercutting his post-debate claim that average Democrats are still with him, even if some big names are turning on him. The new Associated Press NORC Center for Public Affairs research poll conducted as Biden works to salvage his candidacy two weeks after his debate flop also found that only 3 in 10 Democrats are extremely or very confident that he has the mental capability to serve effectively as president, down slightly from 40% in an AP NORC poll in February.