The survey also asked respondents for whom they would vote in a Gardner-Hickenlooper matchup. Hickenlooper led Gardner 53% to 42%, according to the poll.

Among unaffiliated voters, Hickenlooper led Gardner 58% to 33%, and among voters in Arapahoe and Jefferson counties , Hickenlooper leads Gardner 60% to 33%, according to the poll.

“It’s no wonder Gardner is routinely called the most vulnerable incumbent Senator in the country,” pollster Chris Keating said. “He’s barely above water with members of his own party, and the Trump anchor is pulling him beneath the surface with unaffiliated voters, whose support is a necessary ingredient for success in Colorado.”