Sanders, who is opening his official presidential campaign Tuesday in Burlington, Vermont, aims to ignite a grassroots fire among left-leaning Democrats wary of Hillary Rodham Clinton. Yet his supporters in New Hampshire say his local ties and longstanding practice of holding town hall meetings and people-to-people campaigning — a staple in the nation's first primary state — could serve him well. Clinton regularly refers to an economic stacked deck against American workers — rhetoric that offers comparisons to Warren's frequent description of the economic system being "rigged" against middle-class families. The Vermont senator has introduced legislation to make tuition free at public colleges and universities, a major piece of Warren's agenda. The free tuition would be covered by a mix of state and federal money and paid for by higher taxes on Wall Street investment firms, hedge funds and other financial transactions. Clinton frequently tells voters that she would back a constitutional amendment to overturn the Supreme Court decision allowing super PACS to raise unlimited money. During the 1970s, he lost four statewide elections as a third-party candidate, and then narrowly defeated a Democratic incumbent in 1981 to become Burlington's mayor. "Nobody — trust me — nobody thought I would defeat a five-term incumbent Democratic mayor," Sanders said, noting the winning margin of 10 votes.