Tim Canova told "The Young Turks" on Tuesday that "it is a bit disappointing" that Sanders, who has endorsed the law school professor, hasn't campaigned with him.

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"I'm waiting for Bernie to return my call, and not just Bernie, a couple people very high up in his camp," he said. "We are hoping that the Sanders campaign does still come through, that Bernie comes through, and makes an appearance for us or at the very least helps us raise some more money during such a critical period down the home stretch."

Sanders, a former presidential contender, told USA Today earlier this year that he might campaign with Canova as the Democrat tries to unseat Wasserman Schultz, the former chairwoman of the Democratic National Committee Sanders repeatedly criticized through the presidential primary.

"It might be pressure from the Clinton camp," he added. "It might be that he's put his faith and trust in some folks around him who have been negotiating with the Clinton camp and for some reason thought ours was a race to sacrifice."

Clinton has endorsed Wasserman Schultz, and campaigned with her in Florida earlier this month.

Sanders has helped raise money for Canova, a move that the congressional challenger said Tuesday also "galvanized the establishment" and boosted super-PAC funding for Wasserman Schultz.

"This is ground zero for the revolution he's been calling for," Canova said. "While he has done some fundraising emails, you know, all I can say is it's been eight months where I've been putting it all on the line and contributing to his campaign for much of the past year and speaking up for him."