Head Of Medicare, Who Oversaw Obamacare Rollout, Will Step Down

Marilyn Tavenner, the administrator of the federal Centers for Medicare and Medicaid Services, who oversaw the implementation of the Affordable Care Act, will step down.

Tavenner announced her departure on Friday in a message to staff.

"I have great pride and joy knowing all that we have accomplished together since I came on board five years ago in February of 2010," Tavenner said.

Tavenner was at the center of the problematic rollout of Obamacare, the president's signature domestic program. When the HealthCare.gov insurance marketplace was first introd