Sen. Bernie SandersBernie SandersThe Memo: Trump leaves changed nation in his wake Cori Bush dismisses concerns of being 'co-opted' by establishment The Memo: Biden prepares for sea of challenges MORE (I-Vt.) won't rule out a presidential bid if no other liberal candidate steps up to run — but suggested Sen. Elizabeth WarrenElizabeth WarrenBiden pick for Pentagon cruises through confirmation hearing Senate Democrats call on Biden to immediately invoke Defense Production Act Biden consumer bureau pick could take over agency on Inauguration Day MORE (D-Mass.) could fit the bill.

Sanders tells the Burlington Free Press that he'd prefer not to run, but if no one else steps up to challenge the "establishment politicians" in 2016, he may feel compelled to.

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"We need a sense of urgency and I don't see that in establishment politicians and I don't see that in the establishment media," he says. "There are people in this world who, ever since they were 12 years of age, they decided they wanted to be president of the United States. That is honestly not me. ... Anyone who really, really wants to be president is slightly crazy because this is an unbelievably difficult job given the crises that this country faces today."

He indicated Sen. Elizabeth Warren (D-Mass.) might earn his backing if she were to run, however.

"I like Elizabeth Warren very much," he said. "Her beauty is that she is very smart. She speaks English. She can explain economics in a way that everybody can understand."

Sanders has previously said he hasn't ruled out a run but put the odds of that happening at 1 percent.

Sanders said if he did run for president he would "probably" run as an independent rather than a Democrat.