Daniel Biss, a Jewish progressive and current mayor of Evanston, won the Democratic primary for Illinois' 9th Congressional District, positioning him to enter Congress. He narrowly defeated Palestinian American progressive Kat Abughazaleh and state Senator Laura Fine, a centrist candidate heavily funded by the pro-Israel lobbying group American Israel Public Affairs Committee.

In his victory speech, Biss criticized the American Israel Public Affairs Committee, declaring that the district was 'not for sale.' His win was seen by progressives as a sign that the group's significant spending may not be as decisive as in past races, particularly as support for Israel has declined among many Democratic voters.

Despite the high-profile loss, the American Israel Public Affairs Committee claimed broader success across Illinois, saying it helped defeat several candidates it viewed as hostile to the United States-Israel relationship. It invested more than 20 million dollars in multiple contests, backing candidates who won key House races while also suffering notable defeats in others.

The results reflected a mixed night for pro-Israel political spending in the state, with some preferred candidates prevailing and others falling short. The primaries highlighted ongoing divisions within the Democratic Party over Israel policy and the influence of outside money in congressional campaigns.