During the last election, Mitt Romney said Barack Obama "gets full credit or blame for what's happened in this economy, and what's happened to gasoline prices under his watch." That's not really true since there's not much the president can do about either of those things, especially when Congress blocks almost everything important he tries to do. So it would be interesting for someone to ask Mitt — who's sure making noises like he thinks he can be the nominee again — if Obama gets full credit now that gas prices are trending downward.