So he begins his second White House bid with a big head start.

"Bernie really worries about the little guy," said Susan Dodge of Sanbornton, New Hampshire, who voted for Sanders in 2016 and who says she will vote for him again next year. "That's his major concern. He sticks by his message — always has and always will."

But the New Hampshire primary is almost a year away — a lifetime in politics — and there's no guarantee that Sanders can count on the legion of supporters that backed him last time.

For example, Ray Lanier of Concord voted for Sanders in 2016, but now says he has two big concerns: Sanders' age (he's 77), and whether or not he can beat President Trump.

"I certainly understand what age does toyou," said Lanier, who is 78, and who is now considering backing Warren.

Asked how the two senators differ, Lanier answered with one word: "Style."

"As far as policies, I don't see much difference between them," Lanier said.

Style is one difference between the two. Sanders comes from a long tradition of political activism and favors big rallies, long policy speeches, and rarely mentions his own biography.

By contrast, Warren, the former professor, favors smaller events, where she can go one-on-one with voters. And she offers personal stories to explain what ails America today — for example, how her mother held her family together with a minimum wage job at a time when Washington lawmakers asked, "What does it take for a family of three to survive?" Warren says today, lawmakers ask,