In hindsight, it shouldn't be quite so surprising that Sanders won more than 80 percent of voters under 30 in Iowa, New Hampshire and Nevada, or that young single women have flocked to him rather than Clinton. "There's growing evidence that these groups are open to the boldest possible reforms," says Democratic pollster Stanley Greenberg. "But they won't engage unless they think you're leading from the outside and willing to break down this system in which moneyed interests dominate government." Sanders fit the bill.