Berkshire Hathaway and General Electric lose AAA ratings

Fitch lowered Berkshire's rating and S&P lowered GE's rating (which it had held since 1956!) last week. There are only four untainted AAA ratings left: ADP, Johnson & Johnson, ExxonMobil, and Microsoft. (Pfizer's rating is on review for possible downgrade due to borrowing related to its purchase of Wyeth).