Bit by bit, bipartisan negotiations in the Senate over financial regulatory reform have broken down. Richard Shelby, the ranking Republican on the Banking Committee split with the Democratic Chairman, Chris Dodd in February. Bob Corker filled the gap, stepping in to try to hammer out a compromise on an issue in which both parties see the potential for good policy and good politics. But wary of delays after a bitter health care fight, Democrats voted the bill out of committee in March with no Republican support, and now are looking to open up the legislation to amendments and debate on the Senate floor. As recently as last month, Republican leadership was open to a deal.