Insurgent left-wing Democrats are knocking out longtime pro-Israel incumbents, a big win for the party's grassroots and a warning to the establishment.

• In Denver, Democratic Socialist Yassamin Ansari-style candidate Milat Kiros beat 30-year incumbent Diana DeGette, who was seen as too pro-Israel.
• Kiros ran on Medicare for all, housing, and universal child care, and framed DeGette as an out-of-touch, corporate-funded insider.
• Over $3 million in outside money poured in to stop Kiros, but she still won by a wide margin.
• Results were mixed: some anti-establishment candidates won, but centrists like Senator John Hickenlooper held on against progressive challengers.
• Anger at the party isn't only about Israel — voters are fed up with Democrats they see as too soft in fighting Trump.

Outlook: Kiros is favored to win in November, and similar Israel-focused primary fights are heating up, including Susan Collins' race in Maine.