John McCain's campaign has rolled out a rebuttal ad to Hillary Clinton's 3 a.m. economic crisis ad, which singled out McCain instead of Barack Obama. No media buys have been announced yet for the ad, which charges that both Hillary and Obama would answer economic troubles by raising your taxes, but here it is: The ad is an awful lot like Barack Obama's original rebuttal to Hillary's 3 a.m. ad in Ohio and Texas, using mostly the same footage and the same introduction to then parody her — an...