"Hillary Clinton really is one of the weakest . . . nominees with whom the Democrats could be saddled." "Democrats are worried sick about her chances." "Just give someone else a chance, so we in the Democratic Party can elect a Democrat." "She cannot possibly, possibly win." Yada, yada, yada. We've heard all this "Hillary can't win stuff" before. In fact, the quotes above aren't from recent weeks but from six years ago, when many pundits -- and Democrats -- said there was no way that Hillary could get elected to the Senate. She won by 12 percentage points. We...