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President Barack Obama leads Mitt Romney in two new Wisconsin polls.

Obama leads 51% to 45% in a new statewide poll by Quinnipiac University, The New York Times and CBS News.

And he leads by an almost identical margin, 50% to 45%, in a new survey by Marquette University Law School.

Both surveys also are roughly consistent with polls taken earlier this summer. Obama enjoyed an eight-point lead in Marquette's previous poll, taken July 5-8. Obama's lead was six points in a survey taken July 5-8 by Public Policy Polling. It was three points in a poll by Rasmussen Reports taken July 25.

In the new Marquette survey, 50% approved of the job Obama is doing as president, while 46% disapproved.

In the poll by Quinnipiac University, The New York Times and CBS News, 51% approved of the president's performance, while 46% disapproved.

Republican Gov. Scott Walker enjoys similar but slightly more positive ratings in both polls: 52% approve and 44% disapprove of his performance in the Quinnipiac survey, while 51% approve and 44% disapprove in the Marquette poll.

The Quinnipiac survey of 1,428 likely voters was taken July 31 to Aug. 6 and has a margin of error of plus or minus 2.6 percentage points.

The Marquette survey was taken Aug. 2-5 of 1,188 likely voters and has a margin of error of plus or minus 2.9 percentage points. Quinnipiac also polled in two other battleground states at the same time and found Obama leading Romney by four points in Virginia but trailing Romney by five in Colorado.

All three states featured a large gender gap, but the gap was especially large in Wisconsin, with Obama leading Romney by 23 points among women and trailing him by 10 points among men.

Romney's personal ratings remain more negative than positive in Marquette's polling: 36% have a favorable view of him and 48% have an unfavorable view.

"Clearly, that's an area that is holding the Romney campaign back," said Charles Franklin, who conducts the Marquette poll.

While Romney has been the target of a barrage of negative ads from the Obama campaign and Democrats, most of the ads haven't aired in Wisconsin, which hasn't seen the same level of TV advertising as many other battleground states.

Romney's personal ratings were better in the Quinnipiac poll: 41% viewed him favorably, 43% unfavorably. Obama's personal ratings were significantly better in both surveys.