Perhaps three. There's a decent chance that both Stevens (who's a lock for retirement) and Ginsburg will retire this summer. That will allow Obama to appoint three very young and orthodox liberal judges to the Supreme Court. Obama will be gone, but his judicial appoints will continue to hear cases for the better part of the next 30 years. Everyone always forgets that.
Record deficits and expanded federal controls are minor in comparison to the damage his Supreme Court appointees will do!
0bama has already appointed one liberal justice. There is a real possibility that he will appoint another, and possibly two, to the Supreme Court in the next three years. To avoid this long-term travesty, I would have voted for any RINO the GOP put on the ticket.