So, McCain was really popular back then? What changed to make him less popular?
It was probably timing more than anything else.
In 2008, the President of his party was rather unpopular.
Random thought. Who would their running mates have been?
With New Englanders like Joe Lieberman, Howard Dean and John Kerry off the table, I'd imagine Bradley's choice would come down to Dick Gephardt or John Edwards.
Hagel and Thompson were McCain backers, so they might have been on his short lists. He might have tried to woo Maine Governor Angus King to send a message on independence.