Just don’t tell Big Bird. Mitt Romney now leads President Obama by four points, according to a Pew research poll released on Monday—the first national survey since last week’s debate. Sixty-six percent of respondents said they believed the Republican performed better than Obama in the debate, compared with just 20 percent that picked Obama. There were even more devastating results for Obama: the two candidates are even on who is a stronger leader—a category that Obama led by 13 points in September. In the potentially crucial swing state Nevada, polls show that Obama still maintains a slight edge—but the state has been inundated with political ads for both candidates, and the state’s battered economy has been anything but strong over the past few months.