Hillary Clinton has opened up a 10-point national lead over Donald Trump in the Quinnipiac University poll of likely voters out Thursday. Among those likely to vote in November, Clinton grabbed 51 percent in a head-to-head matchup, while Trump earned 41 percent.Clinton drew wide levels of support from women (60 percent to 36 percent), those between the ages of 18-34 (64 percent to 29 percent), and 35-49 (53 percent to 39 percent).