Updated Oct 16, 2026, 2:28 PM ET
Republican · 3 November 2026

James Marter

Member of the Oswego Public Library Board

James Marter, a Republican Oswego Public Library Board member and perennial candidate, is the Republican nominee for Illinois's 14th congressional district in 2026 against Democratic incumbent Lauren Underwood.

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Biography & Campaign Analysis

2026 race

James Marter, an Oswego Public Library Board member and perennial candidate, is the Republican nominee in the 2026 election for Illinois's 14th congressional district.

The district is based in the western exurbs of Chicago and includes all or parts of Aurora, DeKalb, Joliet, Naperville, Oswego, Plainfield and Sycamore. Marter won the Republican primary with 74.9% of the vote, defeating Gary Vician, a realtor and former Naperville township supervisor.

In the general election on November 3, 2026, Marter faces the Democratic incumbent, Lauren Underwood, who was re-elected with 55.1% of the vote in 2024 and was unopposed in the Democratic primary.