Mark Tedford secured the Republican nomination for Oklahoma’s 1st Congressional District after finishing first in the June 2026 primary and prevailing in the August runoff when opponent Jackson Lahmeyer withdrew. The open seat, vacated by Kevin Hern’s Senate bid, sits in a Tulsa-area district rated solidly Republican by multiple forecasters, with a partisan lean exceeding R+11. Tedford’s advantages include substantial fundraising exceeding $1.4 million, local endorsements from mayors and county officials, and name recognition as a sitting state representative. Democrat John Croisant, a Tulsa school board member and insurance agency owner who ran unopposed in his primary, has raised far less and faces structural barriers in a district that delivered Republican margins above 25 points in recent cycles. Trader consensus at 92% for Tedford reflects these fundamentals, though late developments such as turnout shifts or unforeseen controversies could still narrow the gap before the November 3 general election.