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Digging into the pro-Trump vote: Who makes up his base?

Donald Trump remains the leader of the Republican presidential race, getting support of 39 percent of GOP voters, according to the latest online NBC News

Republican presidential candidate Donald Trump speaks at a campaign rally, Feb. 22, 2016, in Las Vegas. (Photo by John Locher/AP)
Republican presidential candidate Donald Trump speaks at a campaign rally, Feb. 22, 2016, in Las Vegas.AP

Mark Murray