To be honest, some just don't care, and they clearly have other agendas.
LLS
While I might have preferred to see the GOP try the nuclear option to stop the democrat obstruction of all of W's appointees, what makes any of us believe that the RINO's in the senate would have gone along with it? I can think of several (Chafee, Snowe, etc.) who would probably have voted with the dems against forcing the rule change, and the nuclear option would have failed leaving the judges that were confirmed after the Gang of 14 compromise languishing until the end of W's 2nd term. In fact, we might have even seen Alito and Roberts blocked by the dems and face the prospect of a SCOTUS with only 7 justices until after January 2009. Thus, how can you say that McCain's participation in the Gang of 14 prevented conservative judges from getting on, or advancing on the federal bench. It may very well be that he enabled some of W's appointees to be confirmed who otherwise would have never been seated at all.