How to Tell If Donald Trump's Candidacy Is Getting Serious

One of America's leading public-opinion researchers says the real-estate mogul generates strong feelings—and has the potential to be a spoiler.

Donald Trump, president and chief executive of Trump Organization Inc., right, is greeted but his daughter Ivanka Trump while announcing he will seek the 2016 Republican presidential nomination at Trump Tower in New York, U.S., on Tuesday, June 16, 2015.

Photographer: Victor J. Blue/Bloomberg

By J. Ann Selzer

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