In the UT I see many who are friendly to one of the political parties trying to blame the other party for the mess. That is understandable, but please take a look and listen to the show below for an interesting take.
What I conclude from the show, if it presents reliable information, the culprit seems to be good old fashioned fraud by those issuing worthless loans and I presume also by those at Fanny and Freddy, who bought them without asking enough questions. I'd bet a lot of money passed under the table. The US needs to send many people to jail to provide some future deterrence while trying to save the system from collapse.