Get used to it, President Hussein will appoint 3 Supreme Court Justices.
And the three he would have replaced are already in the tank for gay marriage. The conservative votes that would be against it are all hale and hearty, and that leaves Tony Kennedy in the middle, and who knows which way he will go. Frankly, we don't absolutely need nine Justices, let the libs resign or die, and we can "bork" Hussein's nominees until we get a new President, if it comes down to that.
There is a silver lining in this decision, if you are dead set against civil union or domestic partnership, and your state has not outlawed same-gender marriage in its constitution. Two out of the now three state Supreme Court decisions that have imposed gay marriage have done so because there was already a "separate but equal" relationship on the books.
You now have a fresh argument to use against CU/DP in your state.
It depends who retires. If Obama is merely replacing liberals with other liberals, the court won't shift to the left.
I suspect Stevens and Ginsburg would retire. What other judge do you think is likely to?