1 / 31

Wisconsin Governor Walker walks off the stage after speaking at the Freedom Summit in Des Moines

Wisconsin Governor Scott Walker walks off the stage after speaking at the Freedom Summit in Des Moines, Iowa, in this file photo January 24, 2015. Walker had a breakthrough moment at a forum for conservatives in Iowa and on Tuesday took a step toward a U.S. presidential run. REUTERS/Jim Young/Files (UNITED STATES - Tags: POLITICS)

Iowa Freedom Summit

The Iowa Freedom Summit took place on January 24, 2015 in Des Moines, Iowa. The Summit hosted a group of potential 2016 Republican presidential candidates to discuss core conservative principles ahead of the January 2016 Iowa Caucuses. (Getty Images)

Find more news-related pictures in our photo galleries and follow us on Tumblr.