Uncertainty, in this case the future of ObamaCare, always invites stock market volatility. If the SCOTUS upholds the reform, then the healthcare sector will see a huge double-digit boom in equity prices. Needless to say, reverse this scenario if they strike down the individual mandate. There's a lot at stake and the markets will go up and down on every meaningful statement or comment coming from the Supremes, especially Justice Kennedy or any other wavering justice. Traders will have one eye on the ticker and the other on the Court.