From Pew:

Mark Blumenthal finds several other polls trending in the same direction:
Both the Pew Research and CBS News polls, which have tracked these questions for two or more years, indicate a big jump in desire to withdraw U.S. forces since the killing of Osama bin Laden in early May. The Pew Research survey shows an eight-point jump over the last month (from 48 to 56 percent). The CBS News survey shows a 16-point jump (from 48 to 64 percent) since a survey conducted in the immediate aftermath of bin Laden's killing.
My point here. But notice Obama's skill in this. He defused the idea that he was a McGovernite by committing to the hawkiest strategy devised by the most gung-ho of the Cheneyites – McChrystal. McChrystal imploded, but the counter-terror campaign revved up under Petraeus with the coup de grace being bin Laden's killing. Now, Obama will try to get the benefit of both fighting a war successfully – unlike his predecessor – and of ending it as soon as public opinion has shifted decisively in his favor.
Leading from behind is an interesting meme. And Obama's decisions tend to look better when viewed in a rearview mirror.