The president's agenda on healthcare and financial regulations sets the stage for a clash with the Supreme Court's conservative majority.
The president and congressional Democrats have embarked on an ambitious drive to regulate corporations, banks, health insurers and the energy industry. But the high court, with Roberts increasingly in control, will have the final word on those regulatory laws.
Many legal experts foresee a clash between Obama's progressive agenda and the conservative court.
"Presidents with active agendas for change almost always encounter resistance in the courts," said Stanford University law professor Michael W. McConnell, a former federal appellate court judge. "It happened to [ Franklin D.] Roosevelt and it happened to Reagan. It will likely happen to Obama too."