Everett McKinley Dirksen was an American politician. A Republican, he represented Illinois in the United States House of Representatives and the United States Senate. As Senate Minority Leader from 1959 until his death in 1969, he played a highly visible and key role in the politics of the 1960s. He helped write and pass the Civil Rights Act of 1964 and the Civil Rights Act of 1968, both landmark pieces of legislation during the civil rights movement. He was also one of the Senate's strongest supporters of the Vietnam War. A talented orator with a florid style and a notably rich baritone voice, he delivered flamboyant speeches that caused his detractors to refer to him as "The Wizard of Ooze".

The positions of majority leader and minority leader are held by two United States senators and people of the party leadership of the United States Senate. They serve as a chief spokespersons for their respective political parties holding the majority and the minority in the United States Senate. They are each elected as majority leader and minority leader by the senators of their party caucuses: the Senate Democratic Caucus and the Senate Republican Conference.