The hopeful caveat comes right up front: This is a Democratic poll and there’s fully a year to go before Coloradans vote.But the caveat comes with its own caveat. An independent poll of the state conducted by Emerson in August found Gardner trailing John Hickenlooper by a similar margin. Emerson had it 53/40. Today’s Democratic poll has it 53/42. Normally it’d be implausible for any incumbent senator to trail by double digits in a swing state, but … Colorado’s not much of a swing state anymore. It’s blue enough that Hillary managed to win it in 2016 when virtually...