Massachusetts U.S. Sen. Elizabeth Warren isn’t ruling out joining ultra-liberal Democratic presidential candidate Bernie Sanders on the campaign trail in New Hampshire, saying she’s not surprised at all that the Vermont senator is surging in the polls and drawing enthusiastic Granite State audiences.

“Bernie’s out talking about the issues that the American people want to hear about,” Warren, who hasn’t endorsed anyone in the Democratic primary yet, told the Herald yesterday.

Asked if she would campaign with Sanders at some point, she didn’t dismiss the idea.

“Too early to say,” she said.

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But Warren didn’t seem convinced that Sanders could eventually knock front-runner Hillary Clinton out of the Democratic primary.

Asked if Sanders can actually win, Warren sidestepped, saying, “Bernie is there on the issues. That’s what matters to a lot of people.”

Warren wouldn’t say whether she’s being lobbied by Sanders or other Democrats, including former Maryland Gov. Martin O’Malley, for her endorsement, and was coy about whether Sanders’ sudden surge is a result of her supporters finally latching on to a candidate now that she’s not running.

“These are people who care about these issues, and that’s who Bernie’s reaching,” she said. “I love what Bernie is talking about. I think all the presidential candidates should be out talking about the big issues.”

Polls have been showing Sanders closing the gap with Clinton to less than 10 points in New Hampshire, where the populist progressive drew large crowds over the weekend, even as the “Draft Warren” crowd looks for a new champion for 2016.

“I’m a big Elizabeth Warren fan, and in lieu of her not running I’m totally going for Bernie Sanders,” said Breeze Grigas, a game designer from Oxford, who met Warren yesterday. “His and her policies are basically almost copied and pasted. … I’d vote for him 30 times if I could. I don’t trust Hillary, honestly. I think a lot of Hillary’s platform is, ‘It’s my turn.’”

During a business roundtable in Worcester yesterday, Warren blasted Republican presidential candidates — including Texas Sen. Ted Cruz — for vowing to repeal Obamacare and warned Democrats the battle over the health care law isn’t over, despite last week’s Supreme Court ruling.

“These guys have figured out — it’s a political game,” Warren said. “And so they want to continue to use the Affordable Care Act — health insurance for fellow citizens — as a punching bag to try to excite their base. … I think this is going to continue to be a fight. And if they want to fight, then we better be ready to fight.”