Lots of people at fault here, going all the way back to LBJ.

From the wikipedia (I know, but its the most condensed version) on the Community Redevelopment Act.

Basically lending money to people who can't pay it back is poor business, and the government shouldn't make banks do it under some misguided sense of fairnness.

Clinton Administration's Changes of 1995

The Clinton Administration's regulatory revisions [1] with an effective starting date of January 31, 1995 were credited with substantially increasing the number and aggregate amount of loans to small businesses and to low- and moderate-income borrowers for home loans. Part of the increase in home loans was due to increased efficiency and the genesis of lenders, like Countrywide, that do not mitigate loan risk with savings deposits as do traditional banks using the new subprime authorization. This is known as the secondary market for mortgage loans. The revisions allowed the securitization of CRA loans containing subprime mortgages. The first public securitization of CRA loans started in 1997. [2]

[edit] George W. Bush Administration's Proposed Changes of 2003

In 2003, the Bush Administration recommended what the NY Times called "the most significant regulatory overhaul in the housing finance industry since the savings and loan crisis a decade ago." [3] This change, which did not pertain to the Community Reinvestment Act, was to move governmental supervision of two of the primary agents guaranteeing subprime loans, Fannie Mae and Freddie Mac under a new agency created within the Department of the Treasury. However, it did not alter the implicit guarantee that Washington will bail the companies out if they run into financial difficulty; that perception enabled them to issue debt at significantly lower rates than their competitors. The changes were generally opposed along Party lines and eventually failed to happen. Representative Barney Frank(D-MA) claimed of the thrifts "These two entities -- Fannie Mae and Freddie Mac -- are not facing any kind of financial crisis, the more people exaggerate these problems, the more pressure there is on these companies, the less we will see in terms of affordable housing." Representative Mel Watt (D-NC) added "I don't see much other than a shell game going on here, moving something from one agency to another and in the process weakening the bargaining power of poorer families and their ability to get affordable housing."