“I will vote for McCain if he resigns his Senate seat before this election”
Why, what does that mean to you? What will it prove?
It means, absent an Obama/loonyVP ticket, that John McCain will be gone from the GOP party forever.
It will mean that RINOs and liberals are not as welcome in the republican party as they currently are.
Besides, judging from the tenor of your question, I assume that you have full faith in mcCains ability to win this year, correct?