The Bush Economic Depression begins..

Ambac is downgraded.

If Ambac and MBIA lose their top ratings, billions of dollars of muni bonds will be downgraded, and the guarantees that have been sold on mortgage-related securities such as collateralized debt obligations, or CDOs, will lose value.
"The destruction of the bond insurers would likely bring write-downs at major banks and financial institutions that would put current write-downs to shame," Tamara Kravec, an analyst at Banc of America Securities, wrote in a note Friday.
Kravec cut her rating on Ambac and MBIA on Friday because she thinks that ratings downgrades are "highly probable" now.