2006 United States House of Representatives elections in Oklahoma
The 2006 congressional elections in Oklahoma were held on November 7, 2006 to determine who would represent the state of Oklahoma in the United States House of Representatives. Oklahoma has five seats in the House, apportioned according to the 2000 United States Census. Representatives are elected for two-year terms; those elected served in the 110th Congress from January 4, 2009 until January 3, 2011. District 1. Seeking a fourth term in Congress, incumbent Republican Congressman John Sullivan faced no difficulty against Democratic nominee Alan Gentges and independent Bill Wortman in  this staunchly conservative district based in the Tulsa metropolitan area. District 2. Incumbent Democratic Congressman Dan Boren, the son of former Governor and U.S. Senator David Boren, easily dispatched with his Republican opponent, Patrick Miller, in this district based in eastern Oklahoma, or "Little Dixie." This district, strongly conservative at the national level, tends to favor Democrats at the local level. District 3. Incumbent Republican Congressman Frank Lucas sought and won an eighth term in Congress from this district, the most conservative district in Oklahoma and the eleventh-most conservative district nationwide. District 4. In this conservative district, based in  south-central Oklahoma, incumbent Republican Congressman Tom Cole easily defeated Democratic opponent Hal Spake to win a third term. District 5. Incumbent Republican Congressman Ernest Istook declined to seek an eighth term in Congress, instead opting to run for Governor, creating an open seat. Mary Fallin, the Lieutenant Governor of Oklahoma, won the Republican primary and was favored to win the general election in this largely conservative district based in the Oklahoma City metropolitan area. Though Fallin was victorious on election day, her margin of victory over Democratic opponent David Hunter was the thinnest margin of any member of the  Oklahoma congressional delegation.