According to them (from their own website...)...
"We stand behind mortgage lenders – local and national banks, thrifts, credit unions, and other financial institutions in all 50 states – to
securitize or buy the mortgage loans they originate, enabling them to replenish their funds so they can lend to other homeowners. Similarly, we work to keep funds flowing to support rental housing."
And their Charter...
"Fannie Mae was chartered by Congress in 1938 to support liquidity, stability, and affordability in the secondary mortgage market, where existing mortgage-related assets are purchased and sold. Our charter does not permit us to originate loans or lend money directly to consumers in the primary mortgage market.
Our most significant activities are
securitizing mortgage loans originated by lenders into Fannie Mae mortgage-backed securities – which we call Fannie Mae MBS – and purchasing mortgage loans and mortgage-related securities for our mortgage portfolio. We obtain funds to purchase mortgage-related assets for our mortgage portfolio by issuing a variety of debt securities in the domestic and international capital markets. We also make other investments that increase the supply of affordable housing."
Of course, if you really want to see how inbred and "fox guarding the hen-house" it all is, just read the titles on the list of the Board of Directors:
http://www.fanniemae.com/portal/about-us/governance/board-directors.html
Former chairman of the FASB, Credit Suisse, Morgan Stanley, Progressive, and the New York City Health and Hospitals former head, Ernst & Young, Diners Club, New York Life, JP Morgan Chase...
And the CEO himself...
"Prior to joining Fannie Mae, Mr. Mayopoulos was executive vice president and general counsel of Bank of America Corporation. Previously, he served in senior management roles at Deutsche Bank AG, Credit Suisse First Boston and Donaldson, Lufkin & Jenrette, Inc."
Those folks are in charge of a quasi-government agency tasked with funding banks. Seriously.