Scott Walker

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** FILE ** Wisconsin Gov. Scott Walker, delivers a State of the State address in Madison. (Associated Press)

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Wisconsin Gov. Scott Walker introduces Gov. Mitt Romney at a campaign event just days before the election while Wisconsin residents grew increasingly weary of robocalls, attacks ads, emails begging for donations and glossy political mail after two years of a near-continuous stream of elections, recalls and recounts in the state. (Associated Press)

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Wisconsin Gov. Scott Walker, who beat back a recall attempt in June, received one of the longest, sustained show of appreciation by the audience of any of the speakers at the Republican National Convention. (Andrew Harnik/The Washington Times)

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Scott Walker

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** FILE ** Republican presidential candidate, former Massachusetts Gov. Mitt Romney, left, shakes hands with U.S. Rep. Paul Ryan, R-Wis., chairman of the House Budget Committee, right, before speaking with supporters of Wisconsin Republican Gov. Scott Walker at a phone bank during a campaign stop in Fitchburg, Wis., in this March 31, 2012, file photo. (AP Photo/Steven Senne, File)

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Wisconsin Gov. Scott Walker (left) and Virginia Gov. Bob McDonnell appear at a news conference at Copland Trucking in Williamsburg, Va., on Friday, July 13, 2012, before the start of the National Governors Association meeting. (AP Photo/Richmond Times-Dispatch, Bob Brown)

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**FILE** Wisconsin Gov. Scott Walker (standing, in red) and state Rep. Peter Barca (in yellow), Kenosha Democrat, talk June 12, 2012, during Walker's "brat summit" at the executive residence in the Village of Maple Bluff, Wis. (Associated Press/Wisconsin State Journal)

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Wisconsin Gov. Scott Walker (rear, left)surveys the crowd at a bipartisan bratwurst-and-beer summit he hosted Tuesday at the governor's mansion for state lawmakers and their staffs. The Republican chief executive was aiming to ease the raw partisanship a week after winning his recall election. (Associated Press)