Norm Coleman was having a rollicking good time between RNC floor speeches Wednesday night with Fox’s Sean Hannity and Alan Colmes — bragging about dropping the Xcel’s first puck and tearing into the Dems — until talk turned to Sarah Palin’s husband’s 1986 DUI. That’s when Hannity launched on pols like Sen. Barack Obama whose decades-old drug use is detailed in his memoirs. For a moment Coleman — whose former roommate called him out as a hypocrite last year for backing laws against a drug (pot) he says Coleman used in college — suddenly looked blank and had nothing to say. Another network’s interviewer might have smelled blood, but Fox has treated the topic of Coleman’s drug use with kid gloves before, and Hannity (and Colmes) let the moment pass.