Scott Walker

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Wisconsin Gov. Scott Walker applauds as Chris Barber of Two Rivers,wis., a welder at Ariens Company, leaves the podium during Walker's State of the State address at the state Capitol in Madison, Wis., Wednesday, Jan. 22, 2014. (AP Photo/Wisconsin State Journal, M.P. King)

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Wisconsin Gov. Scott Walker applauds as Chris Barber of Two Rivers, Wis., a welder at Ariens Company, leaves the podium during Walker's State of the State address at the state Capitol in Madison, Wis., Wednesday, Jan. 22, 2014. (AP Photo/Wisconsin State Journal, M.P. King)

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Wisconsin Gov. Scott Walker makes 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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Wisconsin Gov. Scott Walker delivers 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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Wisconsin Gov. Scott Walker delivers 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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Wisconsin Gov. Scott Walker delivers 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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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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Wisconsin Gov. Scott Walker delivers 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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FILE - In this Jan. 15, 2013 file photo Wisconsin Gov. Scott Walker, center front, acknowledges the gallery during his State of the State address at the state Capitol in Madison, Wis. Walker plans to propose “significant” income and property tax cuts in his State of the State address next week, reductions made possible by tax collections that far exceed earlier estimates, his spokeswoman said Wednesday, Jan. 15, 2014. (AP Photo/Andy Manis, File)

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FILE - In this combination of undated file photos is Republican Wisconsin Gov. Scott Walker, left, and Democrat Mary Burke, who has announced her candidacy for governor. Burke's campaign on Thursday, Jan. 9, 2014, said she has tapped $400,000 of her own money on the way toward raising nearly $1.8 million in the opening months of her effort to unseat Walker. (AP Photo/File)

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Wisconsin Gov. Scott Walker has a new book, a vigorous message and heartland appeal as he negotiates potential presidential-hopeful status in 2016. (Sentinel Books)