The United States Supreme Court begins hearing arguments on the constitutionality of Pres. Obama’s health care reform law. It’s a case that could recast the role of government in this country. And the Obama presidency may hang in the balance. And it’s the hottest ticket in town. Today’s session kicks off with an argument over jurisdiction, and a law that dates back to 1867. Here are Politico’s five things to watch in this week’s oral arguments.








