Standard & Poor's has changed its outlook on US credit from "stable" to "negative." There is a one-in-three chance S&P will soon downgrade the US's previously rock solid triple-A rating. The grim news sent the stock market plummeting on Monday and sent investors into a panic. S&P based its decision on fears partisan disagreements will stall a budget resolution through 2013. The Obama administration is trying to downplay the news while still asking for support to raise the deficit ceiling.