Scott McClellan has been making the rounds trying to sell his new book, What Happened. The poor sap seems to be genuinely surprised that he is being thrown under the bus by all his old buddies in Grand Old Party. I have not read his book, nor am I likely to any time soon. But one of the issues that Scott McClellan raises is that there was no real reason to invade Iraq-well, duh. The Bush White House will go down in history as the worst Presidency ever. And it can all be laid at the feet of George W.…