The Hill: Credit rating agencies reiterated Monday that the U.S. is at risk of a downgrade following the announcement that the supercommittee has failed. Standard & Poor's warned lawmakers not to try and roll back the $1.2 trillion in automatic cuts set to begin in 2013. The rater said an effort to reverse those cuts could increase "downward pressures" on the U.S. rating, which S&P already lowered for the first time in August.