So he writes on his blog:

I have never been asked for any information, background, etc., so as I have said repeatedly in interviews, I didn't consider myself to be under any consideration. I think people thought I was being coy and just not talking, but I have built my political life on trying to shoot straight and tell it as it is and as I see it. I have been honest in telling you that I had no reason to believe I was ever seriously considered or "vetted" for the ticket.