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Ms. Duckworth, an Army helicopter pilot who lost both her legs in a rocket-propelled grenade attack in 2004, focused her victory speech on Mr. Walsh, a tea party candidate who has been in the spotlight for criticizing President Obama. Ms. Duckworth called him an extreme voice for the district, which is one of the most diverse on the congressional map and spans several northwest Chicago suburbs.

Voters also determined the fall matchup for the state’s only open congressional seat, which is being vacated by the retirement of Rep. Jerry Costello, the longest-serving Democrat in the state’s U.S. House delegation. Republican lumber businessman Jason Plummer and Democratic former regional schools superintendent Brad Harriman will be on the November ballot.