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)
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