U.S. House Illinois District 12 Primary

About This Race

The U.S. House Illinois District 12 Primary election will be held on June 16, 2026, to select the Democratic and Republican nominees for the U.S. House of Representatives from Illinois's 12th congressional district. The winner of each party's primary will advance to the general election in November 2026 to represent the district in Congress.

Candidates

Important Dates

Election Date: June 16, 2026
Registration Deadline: May 17, 2026
Early Voting Starts: June 3, 2026
Early Voting Ends: June 15, 2026

How to Vote

Illinois voters can register online, by mail, or in person at their local election office. The registration deadline is May 17, 2026. Voters must present a valid photo ID when voting in person, and early voting is available from June 3 to June 15, 2026, at designated polling places. Vote-by-mail ballots must be requested by June 9, 2026, and returned by election day.

Incumbent

Republican

Mike Bost

U.S. Representative for Illinois's 12th congressional district

Biography

Mike Bost is the incumbent U.S. Representative for Illinois's 12th District, serving since 2015. A former Murphyboro firefighter and small business owner, he is running for re-election to continue advocating for southern Illinois farmers, veterans, and rural communities on issues like agriculture, infrastructure, and healthcare access.

Campaign Website

Democratic

Lisa Madigan

U.S. Representative for Illinois's 12th congressional district

Biography

Lisa Madigan is a former Illinois Attorney General (2003-2019) and daughter of longtime Illinois House Speaker Michael Madigan. She is running for Congress to bring consumer protection and anti-corruption expertise to Washington, focusing on lowering healthcare costs, defending voting rights, and holding utilities accountable for rate hikes in southern Illinois.

Campaign Website

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