Colorado Republican Sen. Cory Gardner is struggling in recent polls, but he is counting on slip-ups from his likely Democratic challenger, former Colorado Gov. John Hickenlooper, to help reset his campaign.

Gardner, first elected in 2014, is down by 13 points to Hickenlooper, according to the RealClearPolitics average. That makes him the most likely Republican incumbent to lose reelection, in a state 2016 Democratic presidential nominee Hillary Clinton won by 5 points.

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