Oklahoma U.S. Sen. Jim Inhofe has defeated four challengers to win the Republican nomination.
Inhofe is bidding for a fourth, six-year term in the Senate. He'll face one Democrat and three independent candidates in the Nov. 4 general election.
Inhofe would be 80 at the start of his term next year. He has rejected knocks from his opponents that he had stayed too long in Washington and wasn't conservative enough. Inhofe's campaign has maintained that he has consistently been ranked among the most conservative members in the Senate.
Inhofe had a health scare last year when he underwent emergency quadruple bypass surgery, but said in a recent interview that he was "overhauled and ready to go."