(NEWSER)Donald Trump did not have a good day in regard to Iowa Thursday. First, a new Quinnipiac poll found that Ben Carson had overtaken him in the state for the first time, and by a decent margin to boot—28% to 20%.

Hours later, Trump's Twitter account retweeted this from a supporter (with hashtags removed): "BenCarson is now leading in the polls in Iowa. Too much Monsanto in the corn creates issues in the brain?" After that drew the attention of a Des Moines Register political reporter, Trump deleted the offending tweet and blamed an intern.

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