I believe the commies now need EIGHT RINOS to pass START..one commie is having surgery so it is 66 needed. Try 58 commies and lugar/bennett/snowe/collins plus corker types and they are very close to 66.
http://thehill.com/blogs/blog-briefing-room/news/134483-democrats-cautiously-optimistic-on-start-passage
I believe the magic number remains 67 -- it's 2/3 of the Senate, not 2/3 of those present and voting.
If they've lost a "Rat", they now need 10 'Pubbies. And I can't imagine that there are that many with a death wish.