This is a poor way to frame a general election campaign. Everybody thinks the economy is lousy and a strong majority thinks George W. Bush has done a poor job, but not everybody thinks Obama is the greatest thing since sliced bread. To get to half-plus-one, he must persuade people who are immune to Obama-mania. He must frame this election in a way that appeals to them. He is not doing that right now.
Obama's moronic messianic message