 With one month to go before the Democratic National Convention, a new poll says about 6 in 10 Democrats believe Vice President Kamala Harris would do a good job if she was at the top of the ticket. The AP-NORC Center for Public Affairs Research poll also found that just 2 in 10 Democrats don't believe she'd make a good president, and another 2 in 10 say they don't know enough to say.