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)

Photo by: J. Scott Applewhite

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)