Paul is not going to get the nomination. He -might- win some primaries, indeed I hope he does win in Virginia given the fun and games over there, but he is not going to win the nomination.
Only the most ardent Paul supporters have ever been under the illusion that he might actually win. Paul himself never has been. The problem is that his participation is mostly hurting the not-Romney candidates. This is as designed for Paul, as he makes very little political distinction between Obama and ALL of his Republican challengers.