Mitt Romney’s former campaign manager on Wednesday argued that Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE is being treated unfairly in the Democratic presidential race.

“Simply put, Secretary [Hillary] Clinton is still her party’s front-runner because of the Democrat establishment and the arcane, unfair and undemocratic process known as ‘superdelegates,’ ” Matt Rhoades wrote on Medium.

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“Consider: among the pledged delegates allocated so far, Senator Sanders trails by approximately 12 percent. But among the superdelegates who have publicly indicated their support, he faces a gap of about 88 percentage points," he continued.

“Because if grassroots voters across the country had their way, there’s a good chance the Democratic Party would be ‘feeling the Bern’ at their convention in Philadelphia. But the Democratic establishment has already picked the winner of their primary: it’s Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE.”

Rhoades served as Romney’s chief strategist during his unsuccessful GOP presidential campaign in 2012. He founded America Rising PAC in 2013. The group runs opposition research on Democratic political candidates and has made targeting Clinton a major focus of its efforts this election cycle.

Clinton has 1,243 pledged delegates in the Democratic race, compared with 979 for Sanders, according to RealClearPolitics. Her edge grows with superdelegates, taking 469 to Sanders’s 29.

A candidate needs 2,382 delegates to clinch the Democratic nomination.

Democratic delegates are awarded in state-by-state voting contests under party rules, and must remain loyal once awarded to a candidate.

Superdelegates, on the other hand, vote at the Democratic National Convention and can vote for whomever they choose.

Sanders’s campaign on Monday revealed it is banking on converting superdelegates to its side as a key part of its strategy.

“I think it is clear now to anyone that knows how to count delegates that neither candidate, Hillary Clinton or Bernie Sanders, is going to win a majority of the delegates to the Democratic convention with just pledged delegates,” top Sanders aide Tad Devine said on a conference call. "Bernie has effectively precluded Hillary from doing that.

“Both candidates are going to have to win the nomination not only with [pledged delegates], but also with party leaders and elected officials.”