Ongoing process. Arlen Specter, Charlie Crist.
As for George Will, I personally see him as irrelevant. I don't think he is persuasive outside of his circle of friends, and I have my doubts that they take him seriously. See too, NRO, Rich Lowrey and his band of misfits.
George just enjoys attending the CPAC Ronald Reagan Dinner where he acts like a Conservative and tells amusing Baseball Analogies for a Free Dinner (and a Speaker’s Fee I assume).
Been to many of them myself, but I had to pay to be there.