Sen. Bernie SandersBernie SandersManafort: Progressives 'cheated by the establishment' with Clinton VP pick Sanders: ‘I am not an atheist’ Trump campaign: Leaked DNC emails prove system is 'rigged' MORE (I-Vt.) won't rule out a presidential bid if no other liberal candidate steps up to run — but suggested Sen. Elizabeth WarrenElizabeth WarrenWarren hammers Trump at Latino event Trump tries to stoke liberal anger at Kaine pick Clinton VP pick could face liberal ire 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.
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.