Two House lawmakers, one Republican and one Democrat, have introduced a bill that would postpone a planned reduction of the high-cost loan limits for Fannie Mae, Freddie Mac and the FHA due to take effect this fall.Late last week, Reps. John Campbell, R-CA, and Gary Ackerman, D-NY, filed H.R. 2508, the Conforming Loan Limits Extension Act, which would mandate a two-year extension to keep conforming loan limits at 2008 levels.