McCain, Obama And SCOTUS

A reader makes an interesting point:

Any discussion of the Supreme Court must take account of the fact that the Democrats will have close to a filibuster-proof majority in the next Senate.  Therefore, the possibility that another Thomas or Scalia will get on the Court is nonexistent. 

A bigger question for McCain is how will he get the sorts of nominees he says he supportsthose in the Roberts and Alito moldonto the Court?  Does he have a strategy for doing so?  If so, I’d like to hear it.  Also, what assurance is there that even if he tries to find another Roberts or Alito that he will be successful? Every postwar Republican president has promised to appoint only strict constructionists, yet many of the most liberal justices of the last 60 years were appointed by Republicans including several on the current Court.  Does McCain have a plan to guarantee that this won’t happen again?  If so, what is it?

I'm guessing it's not there.