Washington (CNN) - Shortly after Kathleen Sebelius was tapped to carry out President Barack Obama's signature health care reform effort, the head of Health and Human Services found herself in the crosshairs of Republicans determined to repeal the law.

The two-term Kansas governor-turned-Obamacare-chief-defender is resigning as health secretary. She's leaving after a problem-plagued rollout of HealthCare.gov, the federal website portal critical to the law's implementation, but with the administration taking a victory lap after unexpectedly reaching and then exceeding its sign-up target of 7 million. FULL STORY

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