Three more Democratic senators said Tuesday they will back the Iran deal, giving the president’s party 41 votes and enough to filibuster a Republican bill voicing disapproval of the nuclear agreement. Sens. Richard Blumenthal of Connecticut, Gary Peters of Michigan, and Ron Wyden of Oregon all announced their support after previously criticizing the deal. “Despite my serious concerns with this agreement, I have unfortunately become convinced that we are faced with no viable alternative,” Peters said. Their support means President Obama will not even have to veto the GOP measure, which will almost surely die in the Senate.