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Campaign Wrap: Primary Turnout Numbers Favor Trump in November

Republican presidential front runner Donald Trump speaks to supporters and the media at Trump Tower in Manhattan following his victory in the Indiana primary on May 3, 2016.

Republican presidential front runner Donald Trump speaks to supporters and the media at Trump Tower in Manhattan following his victory in the Indiana primary on May 3, 2016.

Photographer: Spencer Platt/Getty Images

Even as Donald Trump’s rise has scrambled conventional political wisdom, the lessons of past primary battles should give pause to those doubting the businessman’s chances in the general election.

The caveat: These past races involved politicians who adhered to well-established campaign tactics, while Trump’s candidacy may have fractured his own party