TALLAHASSEE, Fla. -

A new poll shows that President Barack Obama is favored by at least 50 percent of likely voters in the key battleground states of Florida, Ohio and Pennsylvania.

A Quinnipiac University survey shows the president with a lead of 11 percentage points, 53-42 percent, over presumed Republican nominee Mitt Romney in Pennsylvania.

The president leads his GOP challenger by a margin of 51 percent to 45 percent in Florida, and 50 percent to 44 percent in Ohio.

No one has won the White House since 1960 without winning at least two of the states.

Quinnipiac surveyed 1,177 like voters July 24-30 in Florida, 1,193 in Ohio and 1,168 in Pennsylvania.

The margin of error in the Florida and Pennsylvania surveys was 2.9 percentage points and 2.8 percentage points in Ohio.