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Gov. Scott Walker leads Tom Barrett 50% to 44% in a new poll by Marquette Law School of 600 likely voters taken May 9-12.

That’s an improvement for Walker over Marquette’s April 26-29 poll, in which Walker led Barrett 48% to 47% among likely voters.

The Marquette numbers are similar to those in a survey released Tuesday by Public Policy Polling in which Walker led Barrett 50% to 45%.

In the new Marquette poll, 37% said they liked what Gov. Walker has done, 38% said they didn’t like what he has done, and 22% said they liked what he has done but not how he did it.

President Barack Obama is tied with presumptive GOP nominee Mitt Romney 46% to 46% in the new poll among likely voters, down from his lead in late April of 49% to 45% among likely voters.

The margin of error is plus or minus 4.1 percentage points for the sample of 600 likely voters.

Among a larger sample of 707 registered voters, 50% approved of the way Walker is handling his job and 46% disapproved; 45% approved of the way Obama is handling his job and 49% disapproved.

You can read all the results here.