Senate Democrats delivered a major victory to President Obama when they blocked a Republican resolution to reject a six-nation nuclear accord with Iran on Thursday, ensuring the landmark deal will take effect without a veto showdown between Congress and the White House. A procedural vote fell two short of the 60 needed to break a Democratic filibuster . It culminated hours of debate in the Senate and capped weeks of discord since the United States, Britain, France, Germany, Russia and China announced the agreement with Iran in July. The debate divided Democrats between their loyalties to the president and to their constituents, animated the antiwar movement on the left and exposed the diminishing power of the Israeli lobbying force that spent tens of millions of […]