(As is your spelling, btw).
The Constitution specifies that the President is to appoint Justices to the Supreme Court. It is his right to choose whomever he wants to choose, and if that person is qualified (Bill Ayers is a criminal, for goodness' sake - what a silly example), then that person is on the Court.
That's why the Republicans approved the repugnant Ginsburg, and that's why we need to make sure to elect a conservative President in 2012.
Sure they usually make some noise... complain and threaten to do ______ but in the end most of them cave.
In my opinion the Republicans don't want a pro life majority on the court, it would take away a great campaign issue for them.