Bernie Sanders and Elizabeth Warren are both aggressively battling for the backing of Alexandria Ocasio-Cortez — suggesting she could make or break a Democratic run for president, according to a new report.

“I think it’s one of the most important endorsements in America right now,” progressive consultant Rebecca Katz told Politico of Ocasio-Cortez’s support.

Sanders would appear to have an obvious lead, with the New York congresswoman having been a staffer on his 2016 campaign, still working with many of the same people from that time.

But Sen. Elizabeth Warren is making an “aggressive pitch,” Politico says, having met with her privately and written a gushing essay about her for Time magazine — perhaps referring to herself when she wrote, “Millions are taking cues from her.”

Ocasio-Cortez, 29, has insisted she is not planning to make an endorsement anytime soon — and has not been giving any hints.

“I’m very supportive of Bernie,” she said on a Yahoo podcast last month.

“I also think that what Elizabeth Warren has been bringing to the table is truly remarkable.”

Even the campaigns seem unsure who has the edge.

“I know [Ocasio-Cortez] has very strong positive feelings toward Sen. Sanders. I know she also has positive feelings toward Sen. Warren,” Rep. Ro Khanna, co-chairman of Sanders’ campaign, told Politico.

While Sanders and Warren are making the strongest moves, other Democratic candidates — including Sen. Kirsten Gillibrand and Julián Castro — are said to be keen to win her over.

“AOC has captured the imagination of so many young people, so many women and so many non-politicos who really see her as a ray of light,” said Katz, the consultant who has worked on the campaigns of New York City Mayor Bill de Blasio and Cynthia Nixon, who ran for governor last year.