Tom Barrett, the strongest Democratic challenger, to take on Scott Walker in Wisconsin

A Rasmussen Reports poll released Thursday shows likely voters preferring Walker over Barrett 50 to 45 percent with a plus or minus 4.5 percent margin of error.

Other polls similarly show a close race between Barrett and Walker. A Marquette Law School survey ( pdf) conducted Apr. 26-29 found Barrett besting Walker among registered voters 47 to 46 percent, and Walker narrowly beating Barrett among likely voters 48 to 47 percent. Both results are within the poll's margins of error: plus or minus 3.8 percentage points for the full sample and 4.2 points for the sample of likely voters.

A Public Policy Polling survey conducted April 13-15  for the liberal site Daily Kos had Walker beating Barrett 50 to 45 percent among likely voters. That poll's margin of error was plus or minus 2.9 percent.

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