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Ben Carson Edging Close to Front-Runner Trump in Latest Iowa Poll

The real estate mogul has made big gains with voters in the first caucus state, but Carson has the edge with a key constituency.
Ben Carson, 2016 Republican presidential candidate, center, greets attendees as he tours the Iowa State Fair in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015.

Ben Carson, 2016 Republican presidential candidate, center, greets attendees as he tours the Iowa State Fair in Des Moines, Iowa, U.S., on Sunday, Aug. 16, 2015.

Photographer: Daniel Acker/Bloomberg

Retired neurosurgeon Ben Carson has emerged as a leading Republican presidential candidate in Iowa and is closing in on front-runner Donald Trump in the state that hosts the first 2016 nomination balloting contest. 

The latest Bloomberg Politics/Des Moines Register Iowa Poll shows billionaire Trump with the support of 23 percent of likely Republican caucus participants, followed by Carson at 18 percent. When first and second choices are combined, Carson is tied with Trump.