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Bernie Sanders has not conceded to Hillary Clinton, but he's vowing to work with her and advance the progressive agenda.

(File photo)

His speech had the hallmarks of a concession: a plan to work with the frontrunner, a vow to defeat the opposing political party and talk of the campaign's legacy.

But Bernie Sanders didn't concede.

"We must continue our grassroots efforts to create the America that we know we can become. And we must take that energy into the Democratic National Convention on July 25 in Philadelphia where we will have more than 1,900 delegates," he said in a video address Thursday night.

What his role will be at that convention is unclear. Hillary Clinton is the only candidate in the Democratic Party with enough delegates to clinch the nomination, and she's not vetting him as her running mate.

Clinton and Sanders met Tuesday night to discuss how they can unify the party, a discussion in which Sanders was focused on raising wages, lowering college expenses and continuing the progressive movement, according to both campaigns.

His video address Thursday night indicated he will continue to try and push Clinton to the left.

"I look forward, in the coming weeks, to continued discussions between the two campaigns to make certain that your voices are heard and that the Democratic Party passes the most progressive platform in its history and that Democrats actually fight for that agenda," Sanders said.

He said he also looks forward to working with Clinton to make sure the party represents working people and young people, "and not just wealthy campaign contributors."

As he has throughout his campaign, Sanders called for taking on Wall Street and the "powerful special interests that dominate our political and economic life."

Sanders also said he'd work to ensure a Democrat takes the White House in the fall.

"The major political task that we face in the next five months is to make certain that Donald Trump is defeated and defeated badly," he said. "And I personally intend to begin my role in that process in a very short period of time."

Sanders did not elaborate on what his role will be.

He talked about the party's future and his legacy, while encouraging supporters to have a bigger voice in the political process by running for office.

"State and local governments make enormously important decisions and we cannot allow right-wing Republicans to increasingly control them," Sanders said.

He seems to view his campaign as the impetus for changing that America.

"My hope is that when future historians look back and describe how our country moved forward into reversing the drift toward oligarchy, and created a government which represents all the people and not just the few, they will note that, to a significant degree, that effort began with the political revolution of 2016," he said.