A new poll by Quinnipiac University found President Obama and the presumptive Republican nominee Mitt Romney virtually tied in the key swing states of Florida and Ohio, but Obama held onto a solid lead in Pennsylvania. Romney had 44 percent of likely voters to Obama’s 43 percent in Florida, where Obama led by 7 percentage points in late March. In Ohio, Obama had 44 percent to Romney’s 43 percent, and Obama had led there by 6 percentage points in late March. But in Pennsylvania, Obama led with 47 percent of the vote to Romney’s 39, an increase from Obama’s 3-point lead in late March. The poll had a 2.9 percent margin of error.