In the latest Quinnipiac University national survey of likely Republican voters, Trump jumps to 39 percent of the vote, up eight points from the beginning of the month. The Texas senator, meanwhile, saw his share of the vote drop four points to 18 percent. The big winner in the poll other than Trump is Florida Sen. Marco Rubio who held steady at 19 percent despite a setback in New Hampshire. With Cruz's slip, that was good enough to put Rubio in second place in this poll and for the first time the Real Clear Politics average of polls.