A Georgia Republican is set to introduce on Thursday a bill that would replace Fannie Mae and Freddie Mac with a government-owned corporation that could one day be sold off to the private sector. The proposal from Sen. Johnny Isakson, a former Realtor, is the latest in a series of competing measures to address the fate of the mortgage-finance giants whose government takeover has cost taxpayers $151 billion. (snip) To take the place of Fannie and Freddie, the bill would create a new government agency that would provide guarantees on securities comprised of mortgages that meet designated standards. Unlike Fannie...