With President Barack Obama making another pitch for his Iran deal today, his administration’s unprecedented lobbying effort with Capitol Hill Democrats has been bearing fruit.  

Declared Democratic “yes” votes are starting to pile up in the Senate, and relatively few Democrats have come out against the agreement. Obama needs 34 senators to sustain his veto of a resolution of disapproval, and the White House is even more confident about getting the 145 needed in the House. The latest Democrats to come out for the deal Tuesday include Sen. Patrick J. Leahy of Vermont, and Christopher S. Murphy of Connecticut, a day after Bill Nelson of Florida, Tim Kaine of Virginia and Barbara Boxer of California endorsed the deal.  

One key Democrat still undeclared at this point: Sen. Charles E. Schumer of New York.  

The White House has had two recent losses among senior Democrats in the House: Reps. Steve Israel and Nita M. Lowey of New York have both come out in opposition. But the White House believes it has a firewall of sorts among the Democrats who previously supported the Iran framework agreement.