Sen. Sherrod Brown, D-Ohio, leads Republican state Treasurer Josh Mandel by 16 points, according to new Quinnipiac University survey released on Wednesday.
Brown leads Mandel 50 percent to 34 percent in the poll. In the previous survey, released on May 10, Brown led 46 percent to 40 percent over Mandel, who is also an Iraq War veteran.
Mandel has attracted a lot of negative headlines in the local press but he's been the beneficiary of over $8 million in outside spending aimed at attacking Brown, which has kept him in the race. The Democratic Senatorial Campaign Committee is keeping a close eye on the race, and has already reserved fall ad time in the state.
President Obama leads Mitt Romney 47 percent to 38 percent in the Ohio survey.
Quinnipiac's sample is slightly more Democratic-leaning than the previous poll. In the latest poll, 34 percent of voters said they generally consider themselves Democrats, compared to 26 percent who say they are Republicans. In the early May survey, 31 percent of voters were Democrats, and 29 percent were Republicans.
Still, the higher percentage among Democrats only explains part of the net change in the horse-race result. Obama's 9-point lead among independents is a 13-point swing from the previous poll, when Romney led by 4 points among independents.
Quinnipiac surveyed 1,237 Ohio voters from June 19-25. The poll carries a margin of error of +/- 2.8 percent.
-- Steven Shepard contributed