What you have here is a guy saying that “yeah, tax cuts are good for the economy but I wouldn’t do it because it won’t help to re-elect Obama”. Now, once you go down that road Alice the rabbit hole goes down and down.
Krugman has become the equivalent of Rush Limbaugh who says that he wants to see the President fail no matter what (meaning, he preferes the economy to keep tanking and Obama lose 2012 instead of recovery now and 4 more years of Obama).
Now, Rush Limbaugh is a radio talk show host. It is clear that his show is about politics and he will never get a Nobel prize for anything. It is time for Krugman to stop pretending to be an economist.