Republican presidential contenders Republican presidential contenders

Wisconsin Gov. Scott Walker speaks at the Western Conservative Summit, hosted by the Centennial Institute, Colorado Christian University's think tank, in Denver, last month. Walker is announcing a run for the White House, joining more than a dozen Republicans to enter the 2016 contest. Brennan Linsley/AP hide caption

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Brennan Linsley/AP

Joe Allbaugh, left, speaks to the press in Austin, Texas, in this Jan. 4, 2001, photo after being named as director of the Federal Emergency Management Agency by then President-elect George W. Bush.


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On the day he revised his tax plan to 9-0-9, Republican presidential candidate Herman Cain signs a supporter's "999" sign after unveiling his "Opportunity Zone" economic plan in front of the Michigan Central Station, an abandoned train depot in Detroit.

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Bill Pugliano/Getty Images

Left to right: Former Sen. Rick Santorum; Rep. Michele Bachmann; former House Speaker Newt Gingrich; former Massachusetts Gov. Mitt Romney; Rep. Ron Paul; former Minnesota Gov. Tim Pawlenty; entrepreneur Herman Cain. Emmanuel Dunand /AFP/Getty Images hide caption

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Emmanuel Dunand /AFP/Getty Images

NPR's Ari Shapiro on 'Morning Edition'

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