As long as Chafee and Snowe are counted among the 60, we don't have a filibuster proof senate. When it comes to ANWR or several other critical items to conservatives, Chafee and Snowe would cross over to side with the dems to support a filibuster.
chaffee has shown he does not believe in voting for filibusters.
he consistently voted against filibusters even when he opposed the bill and was on the losing side.