Scott Walker

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First lady Tonnette Walker addresses a joint session of the Legislature during Gov. Scott Walker's state of state speech in the Assembly chambers at the state Capitol on Tuesday, Jan. 10, 2017, in Madison, Wis. (AP Photo/Andy Manis)

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Wisconsin Gov. Scott Walker, center, shakes hands with Minority Leader Peter Barca, D-Kenosha, after Walker's state of the state address to a joint session of the Legislature in the Assembly chambers at the state Capitol on Tuesday, Jan. 10, 2017, in Madison, Wis. (AP Photo/Andy Manis)

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Wisconsin Gov. Scott Walker addresses a joint session of the Legislature in the Assembly chambers during the Governor's State of the State speech at the state Capitol Tuesday, Jan. 10, 2017, in Madison, Wis. (AP Photo/Andy Manis)

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Wisconsin Gov. Scott Walker acknowledges people in the gallery during Governor's State of the State address to a joint session of the Legislature in the Assembly chambers at the state Capitol Tuesday, Jan. 10, 2017, in Madison, Wis. (AP Photo/Andy Manis)

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ADVANCE FOR USE SATURDAY, DEC. 24 - FILE - In this Dec 13, 2016 file photo, President-elect Donald Trump and Vice-President-elect Mike Pence hold up Green Bay Packers jerseys given to them by House Speaker Paul Ryan and Wisconsin Gov. Scott Walker at a rally in West Allis, Wis. Wisconsin, for the first time in 32 years, voted to send a Republican presidential candidate to the White House. Trump's road to the nomination touched off a political dance among Wisconsin's top Republicans. U.S. House Speaker Paul Ryan, of Janesville, and Gov. Scott Walker initially held back their endorsement of Trump, but eventually decided to throw their support behind him. (AP Photo/Morry Gash, File)

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Wisconsin Gov. Scott Walker speaks during an interview with The Associated Press, Wednesday, Dec. 21, 2016, in Maple Bluff, Wis. Walker is promising not to leave mid-term or seek a fourth term in office if he decides to seek re-election in 2018 and wins. (AP Photo/Scott Bauer)

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Wisconsin Gov. Scott Walker speaks during an interview with The Associated Press, Wednesday, Dec. 21, 2016, in Maple Bluff, Wis. Walker is promising not to leave mid-term or seek a fourth term in office if he decides to seek re-election in 2018 and wins. (AP Photo/Scott Bauer)

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In this April 3, 2016, file photo, Wisconsin Gov. Scott Walker introduces Republican presidential candidate Sen. Ted Cruz, R-Texas, in Eau Claire, Wis. (AP Photo/Nam Y. Huh, File)

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Republican presidential candidate, Sen. Ted Cruz, right, R-Texas, shares a moment with Wisconsin Gov. Scott Walker at a campaign stop, Monday, April 4, 2016, in Madison, Wis. (AP Photo/Andy Manis)

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FILE - In this Sept. 21, 2015 file photo, Wisconsin Gov. Scott Walker speaks at a news conference in Madison, Wis. Walker says he will announce his endorsement in the Republican presidential race on Tuesday, March 29, 2016. (AP Photo/Morry Gash, File)

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In this Sept. 10, 2015 file photo, Wisconsin Gov. Scott Walker speaks in Eureka, Ill. (AP Photo/Seth Perlman, File)

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Gov. Scott Walker made the hard decision last month to fork over $40,000 from his shrinking campaign coffers to the South Carolina GOP to ensure he would have a spot on that state's crucial primary. The fateful decision proved a fitting symbol for a steep price of admission that Mr. Walker ultimately could not afford. (Associated Press)

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Wisconsin Gov. Scott Walker pauses as he speaks at a news conference Monday, Sept. 21, 2015, in Madison, Wis., where he announced that he is suspending his Republican presidential campaign. (AP Photo/Morry Gash)

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Republican presidential candidates (from left) Rick Santorum, George Pataki, Rand Paul, Mike Huckabee, Marco Rubio, Ted Cruz, Ben Carson, Donald Trump, Jeb Bush, Scott Walker, Carly Fiorina, John Kasich and Chris Christie take the stage during the CNN Republican presidential debate at the Ronald Reagan Presidential Library and Museum on Wednesday in Simi Valley, Calif. (Associated Press) ** FILE **

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Wisconsin Gov. Scott Walker

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Republican presidential candidate Wisconsin Gov. Scott Walker speaks during a meet and greet with local residents, Wednesday, Aug. 26, 2015, in Harlan, Iowa. Walker wowed Republicans at the Iowa Freedom Summit in January, jumping to the top tier of Republican presidential candidates. But in the seven to eight weeks since the Wisconsin governor became an official candidate, he's had to backtrack and clarify his positions on immigration and Islamic terrorists, reassure jittery donors after a lackluster debate performance, and reshape his campaign to try and rekindle the spark that he showed in the middle of the winter in Iowa. (AP Photo/Charlie Neibergall)