On each count, supporters of Bernie Sanders found new reasons to bristle about their choice in November. Hillary Clinton’s selection of Sen. Timothy M. Kaine (Va.) as her running mate angered progressives who had lobbied for someone from their movement. The partial failure of a push to end the use of superdelegates — the party activists and elected officials who are unbound by the primary results — dredged up feelings that the Clinton-Sanders face-off had not been fair.

And the leaked DNC emails, which showed party leaders writing off Sanders’s chances and speculating about how his religious views could hurt him politically, embarrassed Democrats who wanted to put the primaries behind them. Before the party’s rules committee began, Clinton supporter Donna Brazile could be seen walking over to Sanders campaign manager Jeff Weaver to say that nothing she wrote in the emails differed from what she had said in public.

“Certainly, someone should be held accountable for those emails,” Weaver said in an interview. “We spent days talking about who in the Trump campaign should be held accountable after a few sentences were lifted from Michelle Obama’s speech. Certainly, the DNC should be held at least as accountable as the Trump campaign.”…

“The outrage is not just smoldering — it is burning,” said Norman Solomon, a California delegate and leader of the Bernie Delegates Network. “There has been an insurgency in the party, far beyond anybody’s expectations. Hillary seems to have gone out of her way to say — not just to her delegates but to progressives — that she hasn’t learned anything from that insurgency.”