Congressional Black Caucus: Keep superdelegate system in place
© Greg Nash

The Congressional Black Caucus is against eliminating superdelegates, putting the group at odds with Democratic presidential candidate Bernie SandersBernard (Bernie) SandersO'Rourke faces pressure from left on 'Medicare for all' O'Rourke says he won't use 'f-word' on campaign trail O'Rourke not planning, but not ruling out big fundraisers MORE

In a letter first reported by Politico, the CBC also said it is against allowing independents and Republicans to vote in Democratic primaries. 

Both suggestions have been championed by the Sanders campaign. 

"The Democratic Members of the Congressional Black Caucus recently voted unanimously to oppose any suggestion or idea to eliminate the category of Unpledged Delegate to the Democratic National Convention (aka Super Delegates) and the creation of uniform open primaries in all states," says the letter.

It was sent to both Democratic presidential campaigns, as well as to Senate Minority Leader Harry ReidHarry Mason ReidBernie campaign 2.0 - he's in it to win it, this time around Dems wrestle over how to vote on ‘Green New Deal’ Senate confirms Trump court pick despite missing two 'blue slips' MORE (Nev.), House Minority Leader Nancy Pelosi (Calif.) and Democratic National Committee Chairwoman Debbie Wasserman Schultz.

“We want to participate as delegates and that's why this superdelegates system was created in the beginning, so members would not have to run against their own constituents,” said Chairman G.K Butterfield.

Superdelegates have been a flashpoint in the Democratic primary, pitting supporters of Sanders against those backing presumptive Democratic nominee Hillary ClintonHillary Diane Rodham ClintonGOP lawmaker defends Chelsea Clinton after confrontation over New Zealand attacks Klobuchar: Race, gender should not be litmus tests for 2020 Dem nominee Kirsten Gillibrand officially announces White House run MORE

The state Democratic Party in California on Sunday called for the elimination of the use of superdelegates, according to the Los Angeles Times.

Among those supporters of the resolution was Pelosi's daughter. Pelosi endorsed Clinton ahead of the Golden State's primary earlier this month.