Mounting opposition from both the left and the right, a month-long wait to mark-up and newly filed competing legislation in the House could doom the already tenuous effort by two senior senators to move a GSE reform bill this year, say industry observers.Given the need for speed and a closing legislative window, last week’s announcement by Sens. Tim Johnson, D-SD, and Mike Crapo, R-ID, that the Senate Banking, Housing and Urban Affairs Committee would mark up their housing finance reform package on April 29 – well over a month after the bill’s initial March 16 rollout – is not seen as a good sign.