Daniel Mudd, chief executive of mortgage lender Fannie Mae, told CNBC that the housing slump won't hit bottom for another year and that the current credit crunch will spread “all across the housing market.” In an interview, Mudd said Fannie Mae is seeking regulatory approval to increase its lending limits in order to put more liquidity back in the mortgage market, which has been hurt by growing subprime lending troubles and tightening credit. “We’re ready to start investing now,” Mudd said. A lot of "people and institutions in the middle of the system" could benefit from the increased liquidity, he...