They don’t have enough votes to end a fillibuster. Not yet anyway.
Not yet, but wait until after the landslide of '08 and see how the count stands.
GOP primary voters appear to be stupid enough to only offer conservatives a choice between four certified liberal RINOs for nomination, and that's how it stands now that Fred was forced to drop out after he was soundly rejected in supposedly conservative SC by Pubbies who preferred three RINOs over him.
IMHO a Democrat landslide is almost certain now, and Democrats will defeat several of the current Pubby Senators who hold weak seats and also elect Democrats to some of the seats left open by retiring Pubbies. I think it's possible that they could even gain a 2/3 majority in both houses that could pass constitutional amendments, and that's just too scary to even think about.