Nicole Gaudiano

USA TODAY

Sen. Elizabeth Warren appears to be feeling the Bern today, even though she’s not endorsing anyone yet for the Democratic presidential nomination.

The Massachusetts Democrat and progressive darling heaped praise on Sen. Bernie Sanders following a fiery speech he gave Tuesday on the need for Wall Street reform.

Then, walking a fine line, she tweeted later in the morning that she’s glad “ALL the Dem candidates for president…are fighting for Wall St reform.”

Wall Street reform is a signature issue for Warren, a consumer protection advocate who proposed and helped establish the Consumer Financial Protection Bureau in response to the 2008 financial crisis.

"We need to level the playing field and end too big to fail," she wrote in her series of tweets.

On Tuesday, Sanders called for breaking up the biggest banks and reinstating the Glass-Steagall financial law that separated commercial and investment banking activities.

Sanders has co-sponsored Warren’s Glass-Steagall legislation while his rival, Hillary Clinton, has not endorsed that approach. Clinton says her plan is tougher because it addresses risk in the shadow banking sector.

Last month, Warren shared on social media Clinton’s Op-Ed article in the New York Times about her Wall Street reform proposals and wrote in a Facebook post that Clinton was right to fight back against Republicans trying to “sneak Wall Street giveaways” into a government funding bill.

Bernie Sanders: Hillary Clinton hasn't stood up to Wall Street

Warren, who progressives urged to run for president earlier last year, is the only female Democratic senator who hasn’t endorsed Clinton.

Warren told the Boston Herald in a December interview she doesn’t know if she'll endorse.

“It’s just not time for me to do that yet,” she said.

Sen. Elizabeth Warren still hasn't endorsed, but how much does it matter?