In the fifth Swing States survey taken since last fall, Obama leads Republican front-runner Mitt Romney 51%-42% among registered voters just a month after the president had trailed him by two percentage points. The biggest change came among women under 50. In mid-February, just under half of those voters supported Obama. Now more than six in 10 do while Romney’s support among them has dropped by 14 points, to 30%. … In the poll, Romney leads among all men by a single point, but the president leads among women by 18. That reflects a greater disparity between the views of men and women than the 12-point gender gap in the 2008 election.