That's not a slam dunk. Many a time, Republican presidents appoint judges who they thought would be conservative or 'strict constructionists' who turn out to be quite 'liberal'
examples: Justice Brennan and Justice Earl Warren. Also, G Bush Sr appointed David Souter who turned out to be quite liberal.
Given how Joseph Biden and the other minority Dem Senators on the Judiciary committee are keeping an eagle eye out for flaming conservatives like Robert Bork, the chances of appointing an uberconservative would be quite small.