Hassan has 50 percent support in the WBUR poll , with Ayotte at 40 percent. It's the biggest lead for Hassan to date in polls of the race.

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More than 6 in 10 New Hampshire voters, 63 percent, said Trump was unfit to be president, while 31 percent said he was fit.

Views of Clinton were more split, with 48 saying she was fit compared to 46 percent saying she was not.

"There's a very close relationship between the votes for Kelly Ayotte and Donald Trump," explained Steve Koczela, president of MassInc Polling, which conducted the WBUR poll.