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Gingrich: Mitt Romney the 'kind of guy who would have fired Christopher Columbus’

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The former Speaker of the House was referring to a comment Romney made last month in which he painted Gingrich's idea for a lunar colony as ludicrous.

"I spent 25 years in business," Romney said during last month's CNN Florida debate. "If I had a business executive come to me and say they wanted to spend a few hundred billion dollars to put a colony on the moon, I'd say, 'You're fired.'"

While the Columbus jab came from a supporter in Tennessee, Gingrich fired back Tuesday, labeling Romney as a 'realist' incapable of thinking outside the box.

"You either believe we have vision — you know Lincoln had a vision of a transcontinental railroad," Gingrich said. "The Wright brothers had a vision that they could fly, Edison had a vision that we could have electric lights ... we've been a nation of visionaries. And while the cynics and the 'realists' ridicule vision, I believe in the Bible's 'Without vision the people perish.' "

While GOP presidential rivals Rick Santorum and Romney are in a dead heat going into Tuesday's Arizona and Michigan primaries, Gingrich spent the day in Georgia with his sights set on Super Tuesday.