By Christina Hager

DURHAM, N.H. (CBS) — Bernie Sanders polling numbers have remained solid of the last week, and he is still presumed to be the front-runner headed into Tuesday’s New Hampshire primary, according to a WBZ/Boston Globe/Suffolk University tracking poll.

The Vermont senator spent the day reminding voters that he wants to represent the middle class and doubled down on his grassroots campaign.

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“My friend Mr. Buttigieg and my friend Joe Biden, they have dozens and dozens of billionaires contributing to their campaign,” he said to a loud crowd gathered behind his Hudson, N.H. field office.

Bernie Sanders speaks to a crowd in Durham, N.H. on Monday (WBZ-TV)

“So don’t tell me that contributions from billionaires don’t matter, they shape the legislative agenda of what goes on in Washington,” Sanders said.

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He stressed his campaign is funded by ordinary, middle-class people.

The issue is something Sanders and Pete Buttigieg have gone back and forth on. Buttigieg appears to be Sanders’s closest competitor.

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Hundreds of people lined up to see Sanders, Congresswoman Alexandria Ocasio-Cortez, and a concert by the Strokes in the Whittemore Center Arena at the University of New Hampshire Monday night.

Christina Hager