In a simultaneous special election for the remainder of Johnson's term, Knowland won easily. Notably, no candidates were listed on the ballot. Each vote was a write-in, making Knowland technically the first ever write-in candidate elected to the U.S. Senate. In 1954, Strom Thurmond became the first candidate to win a Senate election by write-in where another candidate was actually listed on the ballot.
Results
1946 U.S. Senate special election in California[4]