Gov. Scott Walker takes questions before his speech at the Wisconsin Republican Party convention on Saturday, May 15, 2015, in La Crosse, Wis. (AP Photo/Scott Bauer) ** FILE **
A former Wisconsin Republican Party chairman, Reince Priebus has managed to maintain generally warm acceptance by the 168-member RNC's growing conservative wing as well as by its moderates, who have close ties with the GOP establishment. (Associated Press)
Wisconsin Lieutenant Gov. Rebecca Kleefisch speaks to delegates at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Lieutenant Gov. Rebecca Kleefisch waves to delegates at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
** FILE ** Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Gov. Scott Walker speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Wisconsin Sen. Ron Johnson, R-Wis., speaks at the Republican party of Wisconsin State Convention Saturday, May 3, 2014, in Milwaukee. (AP Photo/Jeffrey Phelps)
Democratic state Rep. Brett Hulsey, a candidate for governor, displays a Ku Klux Klan-style hood he sewed and plans to hand out at the Wisconsin Republican Party convention as a symbol of what he says is the GOP's racists policies on Thursday, May 1, 2014, in Madison, Wis. (AP Photo/Scott Bauer)