MICHAEL BARONE: The Facts in Iraq Are Changing. Read the whole thing, but especially this bit:

If George W. Bush was wrong about the surge from summer 2003 to January 2007, Barack Obama has been wrong about it from January 2007 to today. John McCain seems to have been right on it all along. When asked why he changed his position on an issue, John Maynard Keynes said: “When the facts change, I change my mind. What do you do, sir?” What say you, Sen. Obama?

Indeed.