Lawmakers set to begin a bruising foreign policy fight over the Iran nuclear accord this week are likely to hand President Barack Obama a narrow and partisan victory, but one that saddles Democratic supporters with uncertain political consequences. Both chambers return to Washington on Tuesday after Congress’ annual summer recess, kicking off a fractious fall that will feature acrimonious debate and a possible veto fight over the nuclear agreement. The issue also will set the tone for showdowns later this year over government spending. A stream of Democratic endorsements dribbling out over recent weeks has all but guaranteed the White House will be able to implement the deal before Mr. Obama leaves office in less than two years. The agreement, reached in Vienna on July 14, imposes strict curbs on Iran’s nuclear program that will start to be eased after 10 years. In exchange, the U.S., the European Union […]