The hopeful mood that accompanied the start of President Obama's term has given way to deepening concern about the nation’s economic troubles, according to a new NBC News/Wall Street Journal poll. In the survey, a 52 percent majority of Americans described the nation as headed "off on the wrong track," compared to 36 percent who said the U.S. is "headed in the right direction." Though Obama's overall approval rating remained unchanged at 51 percent, assessments of Obama's handling of the economy have declined. Some 47 percent approve his economic stewardship, down from 50 percent in September, while 46 percent disapprove, up from 42 percent in September. The telephone survey of 1,009 adults, conducted Oct. 22-25, carries a margin for error of 3.1 percentage points.