The Science Behind Trump-Mania

In the new Bloomberg Politics/Des Moines Register Iowa Poll, GOP caucus-goers reveal what draws them to Donald Trump.

Donald Trump, president and chief executive of Trump Organization Inc. and 2016 Republican presidential candidate, greets attendees during a rally at Grand River Center in Dubuque, Iowa, U.S., on Tuesday, Aug. 25, 2015.

Photographer: Daniel Acker/Bloomberg

Donald Trump's startling transformation from reality TV star to serious presidential contender in the eyes of some key Republican voters happened because he's been able to sell himself as the straight-talker most candidates aspire to be, a Bloomberg Politics/Des Moines Register Iowa Poll shows.

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