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Rubio is the GOPer Democrats fear most, says former Obama aide

Dan Pfeiffer, a former White House communications director, called the Florida senator the "most broadly appealing GOP candidate."

Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks at a campaign event, Oct. 8, 2015, in Las Vegas, Nev. (Photo by John Locher/AP)
Republican presidential candidate, Sen. Marco Rubio, R-Fla., speaks at a campaign event, Oct. 8, 2015, in Las Vegas, Nev.AP

Nicole Brown