But Sanders, the runner-up in the Democratic primaries, said he will arrive with a secondary goal in mind: to rally like-minded voters around implementing the Democratic platform adopted at the party’s convention in Philadelphia in July.

That, Sanders said, has to become the focus for progressives “the day after the election.”

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Party platforms tend to be long forgotten by the time campaigns end and governing begins. But Sanders has been determined to change that this year.

After the final nominating contests ended, he began angling to put his stamp on the Democratic platform, aggressively using the process to push the party leftward on issues such as taxes, the minimum wage, college affordability and climate change.

The result was “a very progressive document,” Sanders said, and one that mirrored many of the priorities he detailed during his famously long stump speeches as a presidential candidate, in which he railed against the “billionaire class.”

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Sanders acknowledged that there will be challenges turning the document into actual policy.

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“When you have an agenda that is as progressive as this . . . you obviously engender enormous opposition from the big-money interests,” he said.

Sanders has taken to carrying around a copy of the platform with him, including to an appearance Friday night on HBO’s “Real Time with Bill Maher,” where he displayed it to a live national audience.

Sunday’s joint appearance with Warren is taking place at a student union that serves several college campuses, including the University of Colorado Denver.

During a recent chat, Sanders said, he and Warren decided that they wanted to do an event together geared at the progressive community. Both have been appearing separately on behalf of Clinton. Warren was among those considered a potential Clinton running mate this year.

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Sanders acknowledged that there is still work to be done shoring up support for Clinton among the party’s left wing.

He said one challenge is convincing voters that Libertarian candidate Gary Johnson is not the answer.