In 2006, the last year for which ratings are publicly available, McCain’s ACU rating placed him 47th among US Senators. His lifetime rating placed him 39th among senators in office in 2006.
McCain negotiated with Democrats a few years ago to jump ship, but Jim Jeffords beat him to the punch.
I will never vote for a ticket that has McCain on it, no matter which party he chooses to represent. He is not a conservative. He is a moderate (at best).
Please post a link to that. That is a bit hard to believe. (I know his recent years are some of his worst...)