Nixon was a U.S represenative from 1947-1951 and a SENATOR from 1951-1953. See my previous reply about the number of people who have served in the Senate and became president. Sorry to seem so persisent but I memorized all the presidents when I was in 3rd grade and right now I'm the Ken Jennings of presidential trivial. If you want to know the answer to a presidential question, ask me. If I don't know, then I'll find it in one of my 10 president books.
(Looked it up - "won't have Nixon to kick around was a governor race")