More likely under a Democratic president. LBJ appointed Thurgood Marshall, the first black justice. Bush put Thomas on the court. After all, his father, a conservative, placed David Souter on the court and he has proven to be a liberal influence. With Supreme Court justices, appointed for life-terms, there are no guarantees.
Affirmative action is another area where the court is deeply divided.
If the court goes more conservative, it will probably continue to curtail its use. Brit's Queen Mum. Yale, Harvard etc law degrees don't mean your smarter, just richer. But he's also said he would only appoint judges who strictly interpret the Constitution, and that might be code for someone who opposes abortion. Your question will be at the forefront of public reaction to any Bush nomination.