Jeb Bush Jeb Bush

Former Florida Gov. Jeb Bush again needs a strong debate performance to quiet concerns that his White House campaign is struggling. Mark J. Terrill/AP hide caption

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Mark J. Terrill/AP

Former President George H.W. Bush pumps his fist next to his son, Jeb, during a fundraiser in Tampa, Fla., in 1994. Jeb Bush was running for governor. He lost that year, but won four years later. Chris O'Meara/AP hide caption

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Chris O'Meara/AP

After struggling at the GOP presidential debate, Jeb Bush took his case straight to New Hampshire, where he addressed a crowd outside Geno's Chowder and Sandwich Shop in Portsmouth, N.H. Charles Krupa/AP hide caption

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Charles Krupa/AP

Under Pressure After Debate, Bush Insists He's Not Dead Yet

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Preparations underway in the Media Center at the third Republican debate on the campus of the University of Colorado in Boulder, Colo. Robyn Beck/AFP/Getty Images hide caption

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Robyn Beck/AFP/Getty Images

Gas stations across Iowa, like this Casey's General Store in Des Moines, boast ethanol as "cleaner air for Iowa." Clay Masters/Iowa Public Radio hide caption

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Clay Masters/Iowa Public Radio

Got Corn? Ethanol Is No Longer King In Iowa Among Candidates

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Republican presidential candidates Donald Trump, left speaks at a Republican presidential debate last month, as former Florida Gov. Jeb Bush listens. Mark J. Terrill/AP hide caption

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Mark J. Terrill/AP