Texas Gov. Rick Perry speaks at a campaign event at Clark Electric Co-op on Dec. 27 in Osceola, Iowa. Perry's stance on immigration has troubled some Iowa voters. Justin Sullivan/Getty Images hide caption

toggle caption Justin Sullivan/Getty Images
For Some Iowa Voters, Immigration Is Decisive Issue
  • Download
  • <iframe src="https://www.npr.org/player/embed/144367466/144362989" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">

In a last bout of campaigning before Christmas, Rep. Michele Bachmann of Minnesota signs autographs at the National Motorcycle Museum in Anamosa, Iowa, on Dec. 22. Charlie Riedel/AP hide caption

toggle caption Charlie Riedel/AP
Silent For A Night (Or Two) In Iowa, Candidates Keep Pace In Ads
  • Download
  • <iframe src="https://www.npr.org/player/embed/144276160/144273967" width="100%" height="290" frameborder="0" scrolling="no" title="NPR embedded audio player">
  • Transcript

Republican presidential candidate former House Speaker Newt Gingrich speaks during a Republican presidential debate in Sioux City, Iowa, Thursday, Dec. 15, 2011. Eric Gay/AP hide caption

toggle caption Eric Gay/AP

Republican presidential candidates jockeyed for airtime when they met for their first prime time TV debate on Saturday night in South Carolina. Alex Wong/Getty Images hide caption

toggle caption Alex Wong/Getty Images

Herman Cain (right) speaks as Texas Gov. Rick Perry looks on during a GOP presidential debate at Dartmouth College on Oct. 11.

Andrew Harrer/AFP/Getty Images hide caption

toggle caption Andrew Harrer/AFP/Getty Images