The only two Senators not to vote in the Gay Marriage roll call yesterday...
They have their priorities... are they yours?
You know there's a certain amount of irony here. Your namesake, Richard Nixon, didn't resign from the Senate in 1952 when he was running for the Vice-Presidency.
Oh, and in 1964 Barry Goldwater didn't resign from the Senate.
There is no such law, and nobody ever does. And I don't see the point of such a law either.
And the joke of candidates' presence in the office they still hold is about as old as American elective politics. If not older.
True, there is no law.
Also, I see no need for resignations.
However, Dole DID resign from the Senate to run for President. While I do not particularly like Dole, he's not quite "nobody."