Outrage over Democratic superdelegates is growing among Bernie Sanders’ supporters, as the presidential candidate and his backers work to combat a system they decry as “undemocratic and fundamentally unfair to primary voters.”

Discontent began percolating last week, after Sanders and rival Hillary Clinton walked away with the same number of New Hampshire delegates despite the Vermont senator’s decisive win in the Granite State primary on Tuesday. The counter-intuitive distribution of delegates was attributed to Clinton’s lead among so-called superdelegates—state party elites and elected officials empowered to line up behind the candidate of their choosing.

Now, “Sanders supporters are fighting back,” Politico reports:

Sanders said Sunday on Face the Nation that he’d “just met with a couple [superdelegates] last night” in an effort to woo them to his side. 

“If we continue to do well around the country and if superdelegates—whose main interest in life is to make sure that we do not have a Republican in the White House—if they understand that I am the candidate…who is best suited to defeat the Republican nominee I think they will start coming over to us,” the Vermont senator said in an interview.

Meanwhile, the petitions—each of which had gathered more than 115,000 signatures as of Monday morning—are aimed at showing individual superdelegates “that the grassroots base of the Democratic party wants you to support the will of the party electorate,” MoveOn Washington director Ben Wikler told Politico.

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