The gridlock in Congress and the housing crisis could postpone an overhaul of Fannie Mae and Freddie Mac for another two years. The housing crisis of 2008 has created a situation in which 9 out of 10 housing loans are guaranteed by Fannie and Freddie. The two agencies were created to buy mortgages from the banks, freeing the banks to make more loans. Fannie and Freddie gurantee the loans and then sell them to investors as securities, a process that lowers borrowing costs and makes 30 year mortgages more easily available to homeowners. The Obama administration and the Democrats want to continue some form of government guarantee, and continue government support for the 30 year fixed mortgage. The Republicans oppose any government guarantee because of the losses imposed on taxpayers by the way these agencies operated in the past, with the government guarantees providing the wrong kind of incentives in a housing market prone to bubbles. The fragility of housing markets means anything that raises borrowing costs could put downward pressure on housing prices. As a result the restructuring of the two housing agencies is in limbo. Republicans who want aggressive changes may wait for housing markets to stabilize, making the overhaul a multiyear process. Meanwhile the US Treasury has promised to inject unlimited sums into the mortgage giants through 2012 and nearly $300 billion after that, so that Fannie and Freddie have positive net worth and not go into receivership. The total cost to taxpayers beyond the $134 billion already incurred, is additional capital injection of $146 billion (for a total of $280 billion), because of further problems in the housing market in future years, and another $400 billion to adequately capitalize the entities that replace Fannie and Freddie, according to Standard and Poor's estimates....