Sanders vows to fight ‘until the day of the convention’
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Bernie SandersBernard (Bernie) SandersHeckler yells ‘Mr. President, f--- you’ as Trump arrives at Capitol Veteran New York Dems face upstart challengers Senate passes 6B defense bill MORE says he’s staying in the Democratic presidential primary race no matter the outcome of Monday’s Iowa caucuses, which are lining up to be a nail-biter between himself and Hillary ClintonHillary Diane Rodham ClintonLewandowski says 'womp womp' at story of young girl being separated from mother at border Giuliani: FBI asked me about tease of a 'surprise' before election Republicans tear into IG finding on Clinton probe MORE.

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"We are in this for the long haul," Sanders told CBS News shortly before the caucuses are set to begin. "We're going to be there fighting until the day of the convention. There are a lot of states out there and we now have a strong volunteer base in many, many states.”

Iowa is viewed by many to be a must-win state for Sanders, although he enters caucus night as a slight underdog.

If the Vermont senator loses Iowa, he’s still the heavy favorite to win in New Hampshire.

However, Clinton has a huge lead among minority voters, who are expected to give her a boost once the contests turn to more diverse states like Nevada and South Carolina.

Still, Sanders signaled Monday that he could withstand a loss to Clinton in Iowa.

"We have the resources, we have the energy to continue the struggle and I think at the end of the day we're going to surprise a lot of people,” he said. “I think we're gonna win this thing."