Story highlights "We think it's gonna be a close election, we're working really hard," Sanders told CNN's Jake Tapper

Both Democratic campaigns have tried to manage expectations for the primary

Donald Trump, Hillary Clinton, Bernie Sanders, John Kasich and Chris Christie join Jake Tapper for a special, commercial-free edition of "State of the Union" Sunday at 9 a.m. ET.

Rindge, New Hampshire (CNN) Bernie Sanders has a 2-to-1 edge in the latest CNN/WMUR New Hampshire tracking poll, but the Vermont senator believes Tuesday's primary will be a close one.

"We think it's gonna be a close election, we're working really hard," Sanders told CNN's Jake Tapper on Saturday at Franklin Pierce University here.

It's a sentiment Sanders has echoed for the past five days in the Granite State.

"Don't make me nervous, and don't jinx me," he added.

Both Democratic campaigns have tried to manage expectations for the primary. Hillary Clinton has pushed the narrative that Sanders hails from Vermont and thus has an edge with his New England neighbors. In turn, Sanders reminded voters that Clinton won the state in the 2008 primary when she ran against then-Sen. Barack Obama.

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