Minutes ago rating agency Fitch held the US credit rating at AAA, but switched outlook to negative from stable. The move followed speculation that suggested they might downgrade altogether today. The agency cited fiscal worries as reason for the change in outlook.
http://www.reuters.com/article/2011/11/28/us-usa-ratings-fitch-idUSTRE7AR28J20111128
http://www.reuters.com/article/2011/11/28/us-usa-ratings-fitch-idUSTRE7AR28J20111128