Support for Obama's Iran deal plummets to 21 percent

As Congress prepares to vote on the nuclear agreement with Iran, public support for President Obama’s signature foreign policy achievement has plummeted, with just 21 percent of Americans polled by the Pew Research Center now saying they back the deal.

On a day when the 42nd Senate Democrat came out in favor of the deal, raising the possibility that a resolution to disapprove the deal may never make it to Obama’s desk to veto, the new poll suggests that he is losing the public relations battle.