Bernie Sanders is on a roll. The independent socialist from Vermont, still not a registered Democrat, is drawing big crowds with his gruff populism: 2,500 people in Council Bluffs, Iowa; 7,500 in Portland, Me.; 10,000 in Madison, Wis. He's raised more than $15 million in mostly small donations — "not from billionaires," he crows. He's rising steadily in the polls; one survey shows him only 8 points behind the once untouchable front-runner, Hillary Rodham Clinton, in the early primary state of New Hampshire.