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MILWAUKEE, WI - NOVEMBER 10:  Republican presidential candidates Jeb Bush (L) and Donald Trump (R) look on as U.S. Sen. Marco Rubio (R-FL) speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre on November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10:  Republican presidential candidates Jeb Bush (L) and Donald Trump (R) look on as U.S. Sen. Marco Rubio (R-FL) speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre on November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)

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Alastair Campbell, former spokesman for Tony Blair, and Donald Trump biographer Michael D'Antonio discuss America's long presidential race.

America's election: The view from abroad

Alastair Campbell, former spokesman for Tony Blair, and Donald Trump biographer Michael D'Antonio discuss America's long presidential race.