The White House official who exchanged confidential taxpayer information with the IRS is a longtime Obama advisor and progressive activist who is currently the most powerful official on Obamacare implementation within the White House. Jeanne Lambrew, deputy assistant to the president for health policy, entered Obama-world in 2008 as a health-policy adviser to then-Senator Obama’s presidential campaign. She was subsequently named deputy director and then director of the Department of Health and Human Services’ (HHS) now-defunct Office of Health Reform, where she reported directly to Kathleen Sebelius. Lambrew’s current “deputy assistant to the president” position, while modest-sounding, gives her extensive...