From the WSJ:

Former Massachusetts Gov. Mitt Romney has surged to a clear lead in the Republican race for the presidential nomination, but his party’s attacks on President Barack Obama’s economic stewardship have yet to shake the president’s lead over the GOP, a new Wall Street Journal/NBC News poll finds.

At the same time, rising anxieties over the economy continue to erode the political environment for the president, pointing to a tight re-election fight.

The poll of 1,000 adults, conducted between June 9 and 13, put Mr. Obama’s approval rating at 49%, where it was in April, before Osama bin Laden’s killing had helped nudge it up to 52% in May. Forty-six percent said they disapproved of the job Mr. Obama is doing, a five-point jump from May.