Scott Walker

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GOP potential presidential candidate Wisconsin Gov. Scott Walker called for an amendment to the Constitution to "reaffirm the ability of the states to continue to define marriage."

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In this June 5, 2015, file photo, Wisconsin Gov. Scott Walker speaks during the North Carolina Republican Party convention in Raleigh, N.C. (AP Photo/Gerry Broome, File)

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FILE - In this June 5, 2015, file photo, Wisconsin Gov. Scott Walker speaks during the North Carolina Republican Party convention in Raleigh, N.C. (AP Photo/Gerry Broome, File)

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Wisconsin Gov. Scott Walker talks about a deal to pay for a new arena for the Milwaukee Bucks at a news conference in Madison, Wis., on June 4, 2015. (Associated Press) **FILE**

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Wisconsin Gov. Scott Walker participates in a fundraising ride for Sen. Joni Ernst, R-Iowa, Saturday, June 6, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Wisconsin Gov. Scott Walker talks with Sen. Joni Ernst, R-Iowa, before riding in Ernst's fundraising ride, Saturday, June 6, 2015, in Des Moines, Iowa. (AP Photo/Charlie Neibergall)

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Wisconsin Gov. Scott Walker speaks during the North Carolina Republican Party convention in Raleigh, N.C., Friday, June 5, 2015. (AP Photo/Gerry Broome) ** FILE **

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Gov. Scott Walker rides his 2003 Harley Davidson Road King (image from Gov. Scott Walker)

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Sen. Joni Ernst, shown here on her prized Harley Davidson, will lead a 40-mile motorcyle ride on Saturday - joined by Gov. Scott Walker and Rick Perry. (Image from Sen. Joni Ernst)

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Gov. Scott Walker — shown here on his 2003 Harley Davidson Road King — has used his bike as a political tool on more than one occasion.

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Wisconsin Gov. Scott Walker speaks during Rick Scott's Economic Growth Summit in Lake Buena Vista, Fla., Tuesday, June 2, 2015. (AP Photo/Phelan M. Ebenhack)

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Wisconsin Gov. Scott Walker talks during an interview with The Associated Press in New Orleans in this May 18, 2015, file photo. (AP Photo/Gerald Herbert, File)

A Washington Times story about top Republicans such as Wisconsin Gov. Scott Walker skipping the Iowa straw poll triggered a move by Craig Williams, a member of the state party's central committee, to rally to save the poll. (Associated Press)

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Wisconsin Gov. Scott Walker, right, takes the wheel with former Virginia Gov. Jim Gilmore, center, and former Maryland Gov. Bob Ehrlich during a fundraiser for the Belknap County Republican Committee aboard the motor vessel Mount Washington on Lake Winnipesaukee in New Hampshire, Friday, May 29, 2015. (AP Photo/Charles Krupa)