Former Utah Gov. Jon Huntsman, former Massachusetts Gov. Mitt Romney, former House Speaker Newt Gingrich and Texas Gov. Rick Perry (left to right) take their positions after a break in a debate in Manchester, N.H., Saturday. Elise Amendola/AP hide caption

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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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Herman Cain speaks prior to Florida's straw poll at the Orange County Convention Center on Saturday in Orlando. Cain was a clear winner in the non-binding poll. Mark Wilson/Getty Images hide caption

itoggle caption Mark Wilson/Getty Images