9:13 AM ET Scott Detrow Twitter i Donald Trump speaks to guests at an Oct. 21 campaign rally in Burlington, Iowa. Trump leads most polls in the race for the Republican presidential nomination, but his retweets are — to some extent — still a mystery. Scott Olson/Getty Images hide caption itoggle caption Scott Olson/Getty Images Donald Trump speaks to guests at an Oct. 21 campaign rally in Burlington, Iowa. Trump leads most polls in the race for the Republican presidential nomination, but his retweets are — to some extent — still a mystery. Scott Olson/Getty Images If there's anything more central to Iowa's identity than its first-in-the-nation presidential caucus, it's probably corn. So,...
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