Carter called Bush "the worst president in US history.." He isn't great by any stretch, but Carter seems to forget the double-digit unemployment, double-digit-interest rates, the inflation climbs, the Iranian hostages, the dying inner cities, et cetera that happened on his watch. Not to mention the lack of class when Carter turned Rosa Parks funeral into a political stumping pulpit for the democrats. This whole political and economic fiasco was brought to us by the two parties over the last 15 years or so and our own lack of focus on what the f' was going to happen (aka 'foresight').
