QUINCY - U.S. Sen. Elizabeth Warren said she voted in the Massachusetts presidential primary on March 1.

"Ok, can you share with us who you voted for?" a reporter asked on Thursday, after the Cambridge Democrat toured a community health center here.

"No," Warren replied.

But asked whether Vermont Sen. Bernie Sanders, a socialist running in the Democratic primary, should consider dropping out of the race or stay in until June, Warren said she was "still cheering" for him.

Sanders has repeatedly sought to pull former U.S. secretary of state Hillary Clinton, the frontrunner for the Democratic nomination, closer to the left wing of the party.

"He's out there, he fights from the heart," Warren said. "This is who Bernie is. And he has put the right issues on the table."

Warren largely stuck to talking points that she has repeated in other run-ins with reporters in-person or on television: Clinton and Sanders are talking about how to "rein in Wall Street" and giving kids access to a college education without heavily burdening them with debt, she said.

"I'm not endorsing anyone," Warren said Thursday. "I'm not endorsing Bernie, I'm not endorsing Hillary at this moment. I think it is important what Democrats are doing and that is debating the issues that are really important to the American people."

An endorsement will come "at some point," Warren said. "No, [I] don't have a timeframe."