Scott Walker

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In a Tuesday, Nov. 4, 2014, file photo, Wisconsin Republican Gov. Scott Walker gives a thumbs up as he speaks at his campaign party, in West Allis, Wis. (AP Photo/Morry Gash, File)

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National Edition News cover for October 4, 2014 - Labor union target Scott Walker opens lead in Wisconsin governor's race: Incumbent: Republican Wisconsin Gov. Scott Walker is running on his record of bringing business to the state. (Associated Press)

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incumbent: Republican Wisconsin Gov. Scott Walker is running on his record of bringing business to the state. (Associated Press)

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New Jersey Gov. Chris Christie (right) was in Wisconsin Monday campaigning for fellow Republican Gov. Scott Walker, who is facing a tough re-election campaign against Democrat Mary Burke. (Associated Press Photographs)

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Wisconsin Gov. Scott Walker

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FILE - In this Friday, Aug. 8, 2014, file photo, Wisconsin Republican Gov. Scott Walker speaks at the Republican National Committee summer meetings in Chicago. Court documents released Friday, Aug. 22, 2014, show that Wisconsin Gov. Scott Walker's recall election campaign team told him to instruct donors to give to Wisconsin Club for Growth, which would run ads for Walker and distribute money to other conservative groups backing him. The emails were part of some 1,300 pages released by a federal appeals court from a secret investigation into whether Walker's recall campaign illegally coordinated with conservative groups. (AP Photo/Kamil Krzaczynski, File)

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Wisconsin Gov. Scott Walker helped ensure residents didn't fall into a coverage gap between Medicaid and Obamacare's exchange subsidies. (Associated Press)

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** FILE ** Wisconsin Republican Gov. Scott Walker speaks at the Republican National Committee summer meetings in Chicago, Friday, Aug. 8, 2014. (AP Photo/Kamil Krzaczynski)

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** FILE ** Wisconsin Republican Gov. Scott Walker speaks at the Republican National Committee summer meetings in Chicago, Friday, Aug. 8, 2014. (AP Photo/Kamil Krzaczynski)

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Wisconsin Gov. Scott Walker, a Republican, applauded the Wisconsin Supreme Court's decision to uphold his signature 2011 law that effectively ended collective bargaining for public employees, saying the law had saved taxpayers more than $3 billion. (Associated Press)

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Republican Gov. Scott Walker of Wisconsin, where Medicaid was reformed. (AP Photo/Jeffrey Phelps, File)

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Wisconsin Gov. Scott Walker fended off a 2012 drive by liberals, angered by his disavowal of business as usual, to recall him from office. (Associated Press)

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FILE - In this June 5, 2012 file photo Wisconsin Republican Gov. Scott Walker reacts at his victory party in Waukesha, Wis., after winning a recall election. A person close to a secret investigation of Walker’s campaign and other conservative groups said Wednesday, May 28, 2014 that the governor's attorney is discussing a possible settlement with the lead investigator that would end the probe. The probe focused on alleged illegal campaign fundraising, spending and coordination between conservative groups, Walker's campaign and others during recall elections in both 2011 and 2012. (AP Photo/Morry Gash, File)