1968 United States Senate election in Oklahoma

The Republican Party, also referred to as the GOP, is one of the two major contemporary political parties in the United States. The GOP was founded in 1854 by anti-slavery activists who opposed the Kansas–Nebraska Act, which allowed for the potential expansion of chattel slavery into the western territories. It has been the main political rival of the Democratic Party since the mid-1850s. Like them, the Republican Party is a big tent of competing and often opposing ideologies. Presently, the Republican Party contains prominent conservative, centrist, populist, and right-libertarian factions.

Henry Louis Bellmon was an American Republican politician from the U.S. State of Oklahoma. A member of the Oklahoma Legislature, he went on to become both the 18th and 23rd governor of Oklahoma, mainly in the 1960s and again in the 1980s, as well as a two-term United States Senator in the 1970s. He was the first Republican to serve as Governor of Oklahoma and, after his direct predecessor George Nigh, only the second governor to be reelected.

The Democratic Party is one of two major contemporary political parties in the United States. Founded in 1828, it was predominantly built by Martin Van Buren, who assembled politicians in every state behind war hero Andrew Jackson, making it the world's oldest active political party. Its main political rival has been the Republican Party since the 1850s, with both parties being big tents of competing and often opposing viewpoints. Modern American liberalism — a variant of social liberalism — is the party's majority ideology. The party also has notable centrist, social democratic, and left-libertarian factions.

Almer Stillwell "Mike" Monroney was an American politician who served as a United States senator from Oklahoma from 1951 to 1969, and previously as the United States representative for Oklahoma's 5th congressional district from 1939 until 1951. A member of the Democratic Party, Monroney was the last Democrat to hold Oklahoma’s Class 3 Senate seat.

The American Independent Party (AIP) is a far-right political party in the United States that was established in 1967. The AIP is best known for its nomination of former Democratic Governor George Wallace of Alabama, who carried five states in the 1968 presidential election running on a populist, hardline anti-Communist, pro-"law and order" platform, appealing to working-class white voters and widely understood by political analysts as having pro-segregationist or white supremacist undertones, against Richard Nixon and Hubert Humphrey. In 1976, the party split into the modern American Independent Party and the American Party. From 1992 until 2008, the party was the California affiliate of the national Constitution Party. Its exit from the Constitution Party led to a leadership dispute during the 2016 election.