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AMES, IA - JULY 18: Republican presidential hopeful businessman Donald Trump fields questions from Frank Luntz at The Family Leadership Summit at Stephens Auditorium on July 18, 2015 in Ames, Iowa. According to the organizers the purpose of The Family Leadership Summit is to inspire, motivate, and educate conservatives. (Photo by Scott Olson/Getty Images)
AMES, IA - JULY 18: Republican presidential hopeful businessman Donald Trump fields questions from Frank Luntz at The Family Leadership Summit at Stephens Auditorium on July 18, 2015 in Ames, Iowa. According to the organizers the purpose of The Family Leadership Summit is to inspire, motivate, and educate conservatives. (Photo by Scott Olson/Getty Images)

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Decoding America's long, strange path to the presidency

From Donald Trump's success to self-declared Socialist Bernie Sanders, America's presidential election can be mystifying for an international audience.

Decoding America's long, strange path to the presidency

From Donald Trump's success to self-declared Socialist Bernie Sanders, America's presidential election can be mystifying for an international audience.