Former Vermont Gov. Howard Dean (D) explained Sunday that S&P's downgrade of U.S. credit was primarily the fault of the tea party. "I think the Standard & Poor's downgrade is a good thing because I think it underlines the fact that you can't get out of this without raising revenues," Dean told CBS' Bob Schieffer. "Sixty percent of the deficit is due to the Bush tax cuts. That's CBO saying that not me. You can't get out of this without raising revenues. It is impossible."