Medicare

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Sen. Tom Harkin, chairman of the Senate Health, Education, Labor and Pensions Committee, greets Medicare chief Marilyn Tavenner on Capitol Hill in Washington on Tuesday, Nov. 5, 2013, prior to her testimony before the committee on problems with the debut of the Affordable Care Act. (AP Photo/J. Scott Applewhite)

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** FILE ** Marilyn Tavenner, the administrator of the Centers for Medicare and Medicaid Services, testifies on Capitol Hill in Washington, Tuesday, Oct. 29, 2013, before the House Ways and Means Committee hearing on the implementation of the Affordable Care Act. (AP Photo/J. Scott Applewhite)

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Marilyn Tavenner, administrator of the Centers for Medicare and Medicaid Services, pauses while testifying on Capitol Hill in Washington on Tuesday, Oct. 29, 2013, before the House Ways and Means Committee on the implementation of the Affordable Care Act. (AP Photo/J. Scott Applewhite)

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Marilyn Tavenner is administrator of the Centers for Medicare and Medicaid Services. (AP Photo/Manuel Balce Ceneta)

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**FILE** A Yazoo City, Miss., resident holds copies of a Medicare-approved drug card application on July 27, 2004, in Yazoo City. (Associated Press)

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** FILE ** Social Security Administration Commissioner Michael J. Astrue speaks at a news conference on the Social Security and Medicare trustees report at the Treasury Department in Washington on Aug. 5, 2010. (AP Photo/Charles Dharapak)

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** FILE ** In this Aug. 16, 2012, photo Republican presidential candidate, former Massachusetts Gov. Mitt Romney writes on a white board as he talks about Medicare during a news conference in Greer, S.C. As they rush towards their party conventions, the rival presidential campaigns are trying to invigorate core supporters while reaching out to a sliver of undecided voters who harbor doubts about President Obama yet aren't sold on Romney. (AP Photo/Evan Vucci)

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Republican presidential candidate Mitt Romney writes on a white board Aug. 16, 2012, as he talks about Medicare during a news conference at Spartanburg International Airport in Greer, S.C. (Associated Press)