A volunteer prepares labels for seats ahead of Wednesday's presidential debate at the University of Denver. Credit: Associated Press

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Marquette University Law School's latest poll in the presidential race shows President Barack Obama leading Republican challenger Mitt Romney by 11 points in Wisconsin - 53% to 42%.

The results show Obama's lead narrowing slightly. In the last poll on Sept. 19, Obama had a 14-point lead - 54% to 40% - over Romney. In August, Obama's lead was far smaller - 49% to 46%.

The poll was released just hours before Obama and Romney faced each other in their first debate.

The poll of 894 likely voters was conducted Thursday through Sunday and has a margin of error of plus or minus 3.3 percentage points.

Fifty-two percent of likely voters approved of the job GOP Gov. Scott Walker is doing; 46% disapproved.

The survey respondents were also reminded of a recent court decisionlargely striking down Walker's signature law sharply limiting collective bargaining for most public workers. A near majority - 49% - said they would like to see Walker's law kept in place; 44% said they would like to see public-sector collective bargaining restored to what it was.