She will be replaced by someone that no one has ever heard of.

Sebelius Resigns

Officials said Ms. Sebelius, 65, made the decision to resign and was not forced out. But the frustration at the White House over her performance had become increasingly clear, as administration aides worried that the crippling problems at HealthCare.gov, the website set up to enroll Americans in insurance exchanges, would result in lasting damage to the president's legacy.

NY Times.