Scalia and Kennedy will NOT retire under Obama. They will not go down easily.
However, time is NOT on their side. They will be above 80 after Obama leaves office. Byron White was against Roe vs Wade. He had some conservative views. He retired under Bill Clinton who appointed the more liberal Ginsberg.
Here is a diary where commenters say how likely and promising a two term hillary clinton presidency WILL shift the court to the left.
So I am confident that Hillary Clinton will be excellent in terms of shifting the court back to mainstream center-left. We need that badly. Hillary Clinton is way underappreciated in terms of progressiveness. I know there are people who will interject. But please consider this: Ted Kennedy called her a champion of working people and women.
Nancy Pelosi wants Hillary Clinton to be president.
I know Hillary Clinton will be a fantastic president. She will build on Obama's progress and she is great on 80%-90% of the issues. She can be pushed with left pressure too :)
It is going to be a struggle but we are MOVING towards sanity. The insanity and 1% war against good people is slowly ending.