Ever since the DNC tried to rig the 2016 primaries against Sanders, the DNC has had trouble with fundraising. The DNC brand was tarnished and donors don't want to give them money.
Now the DCCC is in danger of doing the exact same thing the DNC has done.

The epicenter of this is Marie Newman's challenge to eight-term Rep. Dan Lipinski.
Last week I pointed out that getting on the DCCC blacklist has its advantages.

The news and the show of support from outside groups had an impact. Between Friday morning and Monday evening, Newman’s campaign raised an additional $44,646 from 2,442 online donors, demonstrating that a segment of the Democratic electorate is motivated to help candidates precisely because they are shunned by the party establishment.

Which shows how much the DCCC is hated amongst voters.
In the last few days grassroots organizations responded as well.

Not intimidated by the DCCC's widely condemned policy of blacklisting organizations that support primary challengers against Democratic incumbents, a coalition of progressive groups on Monday endorsed Marie Newman's campaign to oust "anti-choice, anti-LGBTQ" Illinois Rep. Dan Lipinski in 2020.
...EMILY's List, MoveOn, Democracy for America (DFA) Planned Parenthood, and the Progressive Change Campaign Committee (PCCC) joined NARAL in endorsing Newman on Monday.

In an email to supporters, the PCCC said the coalition's endorsement of Newman is an explicit "rebuke of the DCCC's 'blacklist' of progressive consultants."

This is no small rebellion, and it is likely to spread in the coming months as more challenges happen.
Six days ago 42 colleges planned to boycott the Democratic Congressional Campaign Committee (DCCC) in protest of the new policy.
In just five days that number has jumped to 68 colleges.

The youths in the Democratic Party are angry.

Sixty-eight chapters of the College Democrats are urging voters not to donate to the party’s congressional-campaign arm after it instituted a new policy to protect incumbents from primary challenges. The protesting students say that the change will deter young candidates and people from historically marginalized communities from running for office. Their outrage isn’t just noteworthy because they represent younger voters in the electorate—these young people are also some of the party’s key organizers and activists.
...
The fact that the College Democrats—the party’s stalwart organizers and its future leaders, staffers, and reliable voters—have joined in the protest demonstrates that they, too, are worried the party is setting itself up for failure.
...“The next generation of grassroots activists and organizers are really not happy with the way the Democratic Party is conducting itself,” Pearce says.

Obviously this is a deadly serious problem for the DCCC, so naturally they have carefully listened to their base and backtracked...ROTFL! Of course not! This is the Democratic Party. They only care about large donors, not voters.

May 6--U.S. Rep. Cheri Bustos defended Monday her efforts as head of the Democratic Congressional Campaign Committee to back party incumbents over challengers as Marie Newman picked up several progressive endorsements in her challenge to eight-term Southwest Side and suburban Rep. Dan Lipinski.