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Then-Sen. Barack Obama drew enthusiastic crowds at a rally in Columbus, Ohio, just days before the 2008 election. Now, after a few rocky moments with the coalition that helped send him to the White House, and with a re-election battle looming, Obama is trying to re-energize his supporters. Joe Raedle/Getty Images hide caption

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Joe Raedle/Getty Images

Social Security has been compared to Ponzi schemes for decades, says Indiana Gov. Mitch Daniels. In his new book, he lays out ideas for improving the system. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images

Texas Gov. Rick Perry speaks at the Conservative Political Action Conference this month in Orlando, Fla. The next day, he finished a disappointing second in the Florida GOP straw poll. Mark Wilson/Getty Images hide caption

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Mark Wilson/Getty Images