Newt Gingrich, Mitt Romney, and Mike Huckabee When former Washington Mayor Marion Barry mounted his political comeback after being caught smoking crack cocaine, he tried to turn his difficulties with drugs into an asset. "I'm in recovery," he said, "and so is my city." The pitch didn't make him mayor again (though he did win election to the city council), but it was one of the most entertaining attempts to solve a problem that all politicians face: how to handle that one liability that could sin...