The polls are open in Wisconsin to decide which Democrat will face Republican Gov. Scott Walker in a rare recall election set for June 5.
Milwaukee Mayor Tom Barrett and former Dane County Executive Kathleen Falk are the two leading Democrats out of the four on Tuesday's ballot.
Other Democrats on the ballot are Secretary of State Doug La Follette and state Sen. Kathleen Vinehout. Gladys Huber, a Republican, is running as a Democrat in Tuesday's election.
Walker and other Wisconsin Republicans are facing recall elections for pushing through a law last year that stripped most unionized public workers of collective bargaining rights.
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