Elena Moore Daniel Biss, the mayor of Evanston, Ill., sits for a portrait at his campaign office on February 28, 2026, ahead of the Illinois primary. Jamie Kelter Davis for NPR hide caption Daniel Biss, the mayor of Evanston, Ill., has won the Democratic primary for the state's 9th congressional district, according to a race call by The Associated Press, topping a crowded field in the race for a Chicago-area seat that has not been open for nearly three decades. His victory in the safe blue district ends a highly contested primary of more than a dozen Democrats running to succeed retiring Democratic Rep. Jan Schakowsky, 81, who first took office in 1999. With endorsements from Schakowsky and other national leaders such as Sen. Elizabeth Warren, D-Mass., Biss was seen as the frontrunner heading into the race. On the campaign trail, he sought to differentiate himself by emphasizing both his background in elected office and his willingness to push for progressive causes and against President Trump's agenda.…