Sen. Bernie SandersBernie SandersOvernight On The Money — Senate Democrats lay out their tax plans Overnight Health Care — Presented by Altria — FDA advisers endorse Pfizer vaccine for kids Manchin: 'I think we'll get a framework' deal MORE (I-Vt.) defended running for president without the aid of a super-PAC to Stephen ColbertStephen Tyrone ColbertFox's Bret Baier: Jan. 6 was a 'dark day' for US 'similar to what we saw in 1876' Fox's Gutfeld mocks late night hosts for planned 'climate night' Stephen Colbert, Comedy Central unveil two new animated political satires MORE on Friday evening, telling the “Late Show” host he’s ginning up plenty of grassroots support without one, according to reports.

“If you want to win it, sir, you’ve got to be in it,” Colbert said. “Every tool in the chest. Don’t bring a spoon to a knife fight.”

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Sanders responded: “I don’t support the agenda of corporate America or the billionaire class. I don’t want their money.”

“That’s called a people’s campaign, not a billionaire’s campaign,” he added.

Even Colbert acknowledged that crowd sizes at Sanders events have been impressive.

“A guy in his 70s filling stadiums. Who does he think he is? A Rolling Stone?” he quipped.

The socialist senator again went after the GOP front-runner, Donald TrumpDonald TrumpJan. 6 panel plans to subpoena Trump lawyer who advised on how to overturn election Texans chairman apologizes for 'China virus' remark Biden invokes Trump in bid to boost McAuliffe ahead of Election Day MORE, for his controversial remarks on immigration.

“I think that what Trump is doing is appealing to the baser instincts among us — xenophobia, and frankly, racism — describing an entire group of people, in this case Mexicans, as rapists or criminals. I think that’s disgraceful, and not something we should be doing in 2015,” Sanders said.

Sanders rejected comparisons to 2008 candidate Ralph Nader, saying his rising polling numbers and huge rallies indicate genuine momentum, not just a bump in the road for his leading competitor for the Democratic nomination.

“If you look at the polls, we do almost as well … as Hillary ClintonHillary Diane Rodham ClintonThe real reason Biden is going to the COP26 climate summit Super PACs release ad campaign hitting Vance over past comments on Trump I voted for Trump in 2020 — he proved to be the ultimate RINO in 2021 MORE,” Sanders said, "and that will only get better in the future.”