Scott Walker

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Wisconsin Gov. Scott Walker talks about the release of thousands of emails and other documents collected during a criminal investigation of a former aide on Wednesday, Feb. 19, 2014, in Madison, Wis. Walker said he expects his political enemies to use the emails against him, but he doesn't expect there to be any surprises. (AP Photo/Scott Bauer)

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Wisconsin Gov. Scott Walker says his fellow Republicans are doing the party and the country a disservice if they aren't focused on the upcoming 2014 elections. (Associated Press)

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Assembly Democratic Minority Leader Peter Barca speaks out against Gov. Scott Walker's proposed $504 million property and income tax cut proposal on Tuesday, Feb. 11, 2014, in Madison, Wis. (AP Photo/Scott Bauer)

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Gov. Scott Walker says he is open to making tweaks to his property and income tax cut plan on Wednesday, Feb. 5, 2014, in Madison, Wis. Senate Republicans are discussing possible changes to the tax cuts, while the Assembly is moving ahead with a vote on Walker's proposal as introduced. (AP Photo/Scott Bauer)

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This photo taken Jan. 23, 2014 shows Wisconsin Gov. Scott Walker, right, addressing legislators during the Governor's State of the State speech in the Assembly chambers at the state Capitol in Madison, Wis. Walker introduced new members of his state's workforce and said the proceeds from a projected budget surplus belong to the taxpayers. All governors look forward to an annual address before state lawmakers and the public, a mini-bully pulpit that offers a televised platform to publicize their accomplishments and rally support for their agenda. For a group of governors with White House aspirations, the speeches offer a framework for how they might appeal to early voting states like Iowa, New Hampshire and South Carolina, and how they might one day govern. (AP Photo/Andy Manis)

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FILE - Wisconsin Gov. Scott Walker acknowledges guests during his State of the State address to a joint session of the Legislature in the Assembly chambers at the state Capitol Wednesday, Jan. 22, 2014, in Madison, Wis. Walker made the case in his State of the State speech Wednesday that extra money collected thanks to an improving national economy should be returned as property and income tax cuts, even as some Republicans are saying his proposal goes too far. (AP Photo/Andy Manis)

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Gov. Scott Walker defends his $504 million tax cut plan, saying he expects it to pass with bipartisan support, on Thursday, Jan. 23, 2014, in Madison, Wis. (AP Photo/Scott Bauer)

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Gov. Scott Walker defends his $504 million tax cut plan, saying he expects it to pass with bipartisan support, on Thursday, Jan. 23, 2014, in Madison, Wis. (AP Photo/Scott Bauer)