Full text of the S&P report for the US credit downgrade, AA+
Searching for this report, I found more meta-coverage than links to the source. Below is the full text of the document itself, and the decision rendered by S&P in the downgrade, titled "Research Update: United States of America Long-Term Rating Lowered To 'AA+' On Political Risks And Rising Debt Burden; Outlook Negative." Reposted directly from S&P.