"The story is mixed across the four most important states," said Doug Usher, director of the polling firm's research arm. "He gained in Ohio and Virginia, but lost ground in Colorado and Florida."
Polls show Romney closing gap with Obama in swing states →
Mr. Obama showed "marginal improvements" in the survey against both former Massachusetts Gov. Mitt Romney and former House Speaker Newt Gingrich in the past month, said pollster Doug Usher.
New polls find uptick in Obama approval →