Standard and Poor's on Bush Tax Cuts

S&P would upgrade the US to "stable" if the Bush tax cuts for the rich were allowed to lapse:

Our revised upside scenario--which, other things being equal, we view as consistent with the outlook on the 'AA+' long-term rating being revised to stable--retains these same macroeconomic assumptions. In addition, it incorporates $950 billion of new revenues on the assumption that the 2001 and 2003 tax cuts for high earners lapse from 2013 onwards, as the Administration is advocating.

Sources:

United States of America Long-Term Rating Lowered To 'AA+' On Political Risks And Rising Debt Burden; Outlook Negative [pdf] Standard and Poor's, Primary Credit Analyst:
Nikola G Swann, CFA, FRM, Toronto, August 5, 2011.