Mark Ruffalo also recorded a video encouraging the Massachusetts senator to enter the presidential race

Credit: Justin Sullivan/Getty; Saul Loeb/AFP/Getty; Inset: Mike Marsland/WireImage

Elizabeth Warren might be the most popular candidate not running for president.

The Massachusetts senator, 65, has repeatedly said she has no intention of entering the 2016 presidential race, but that hasn’t stopped celebrities including Mark Ruffalo, Susan Sarandon and Ed Norton from urging the progressive leader to reconsider.

If she does decide to run, it appears the former Harvard Law School professor would have support from one high-profile person who would also be her rival: Hillary Clinton.

The former secretary of state, who officially announced her entry into the race on Sunday, paid tribute to the Wall Street watchdog in TIME magazine Thursday, which named Warren one of its TIME 100 Most Influential People of the year.

“Elizabeth Warren’s journey from janitor’s daughter to Harvard professor to public watchdog to U.S. senator has been driven by an unflagging determination to level the playing field for hardworking American families like the one she grew up with in Oklahoma,” Clinton writes. “She fights so hard for others to share in the American Dream because she lived it herself.”

Clinton also points out that Warren boldly takes on people in positions of power, whether on Wall Street or in politics.

“She never hesitates to hold powerful people’s feet to the fire: bankers, lobbyists, senior government officials and, yes, even presidential aspirants,” Clinton also writes.

Clinton’s piece comes less than a week after Ruffalo, 47, recorded a video urging Warren to run – joining other voices as part of the #DearElizabethWarren grassroots campaign.

“On behalf of myself, on behalf of my children, on behalf of the future generations of the United States, would you please, please not say no to running, at least being in a primary, and take your rightful place in the history of this great nation,” he said in a video filmed at a New York City playground.