20% of Democratic voters think Joe Biden has dementia — and he's still up by 9 points

A shocking number of American voters believe presumptive Democratic nominee Joe Biden has dementia, yet that hasn't prevented the 77-year-old candidate from climbing to a sizable lead over President Trump in recent polls.

According to a new survey from Rasmussen Reports, 20% of Democrats and 38% of all likely U.S. voters believe the gaffe-prone former vice president suffers from some form of cognitive impairment, and a majority of voters, 61%, believe it is important for Biden to address the issue publicly.

Of the 61% who say that Biden should address the issue, 41% say it is "very important" that he do so.

The poll was conducted between June 25 and 28 and surveyed 1,000 likely voters.

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