Paul Krugman is throwing Obama under the bus. His latest column can be summarized like this: The idiot Republicans are turning the US into a banana republic; Barack Obama could have easily stopped them but he is feckless and weak.Obama was going to be the new Lincoln or FDR. Then the new Clinton. Then it was Carter. Then it was Hoover. Now Krugman’s take suggests a new comparison: James Buchanan, the feckless president who presided feebly over the breakup of the Union in 1860-61.