http://www.huffingtonpost.com/2011/0..._n_919867.html

The move came after Congress haggled over budget cuts and the nation's borrowing limit – and failed to cut enough government spending to satisfy S&P.
No, you reap what you sow. Because the blame is bi-partisan in nature at best.

From the same article you posted,

However, one of S&P's explicit criticisms of the compromise was that it didn't address the biggest drivers of the nation's debt -- Social Security and Medicare
Whose babies are those?