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Delegate math: Here’s how a contested convention could happen

The delegate math is becoming increasingly clear: The March 15 Florida and Ohio contests will determine if Donald Trump is the sure-to-be Republican nominee.

Republican presidential candidate Donald Trump reacts to supporters during a rally at Valdosta State University Feb. 29, 2016 in Valdosta, Ga. (Photo by Mark Wallheiser/Getty)
Republican presidential candidate Donald Trump reacts to supporters during a rally at Valdosta State University Feb. 29, 2016 in Valdosta, Ga.Getty Images

Mark Murray