Tom Harkin

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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 ** Sen. Tom Harkin, D-Iowa, chairman of the Health, Education, Labor, and Pensions Committee. (AP Photo/J. Scott Applewhite)

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FILE - In this July 18, 2013 file photo, Sen. Tom Harkin, D-Iowa speaks on Capitol Hill in Washington. Harkin is one of many proponents of a bill that would prohibit employers from discriminating against workers on the basis of sexual orientation or gender identity. (AP Photo/J. Scott Applewhite, File)

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Sen. Tom Harkin, Iowa Democrat, is at the center of negotiations to strike a deal on the cost of college student loans before rates double Monday. (Associated Press)

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Sen. Charles E. Schumer, New York Democrat, speaks as Sen. Tom Harkin (left), Iowa Democrat, listens during a news conference on House Speaker John A. Boehner's proposal regarding the "fiscal cliff," on Capitol Hill in Washington on Wednesday, Dec. 19, 2012. (AP Photo/Jose Luis Magana)

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Sen. Charles E. Schumer, New York Democrat, listens to Sen. Tom Harkin, Iowa Democrat, during a news conference about House Speaker John A. Boehner's proposal regarding the "fiscal cliff," on Capitol Hill in Washington on Wednesday, Dec. 19, 2012. (AP Photo/Jose Luis Magana)

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ASSOCIATED PRESS Sen. Tom Harkin looks over the shoulder of Paul Dunfee, a hot mill operator, during a tour of PMX Industries in Cedar Rapids, Iowa. The metals company donated $250,000 to an institute at Iowa State University that bears Mr. Harkin’s name, and its CEO did the same. Mr. Harkin is pushing for a dollar coin that could generate tens of millions of dollars in new business for the company.

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Sen. Charles E. Schumer (right), accompanied by (from left) Sens. Bernard Sanders, Tom Harkin and Chris Coons, gestures during a news conference on Capitol Hill in Washington on Thursday, Dec. 6, 2012, about the possibility of Americans abruptly losing their jobless benefits at the end of the year. (AP Photo/Jacquelyn Martin)

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Sen. Tom Harkin, Iowa Democrat, holds the four-volume report asserting that for-profit colleges often hit students with exorbitant tuition, aggressive recruiting and abysmal outcomes. Monday, July 30, 2012, on Capitol Hill in Washington. (Associated Press)

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**FILE** Democratic Sens. Jack Reed (left), of Rhode Island, and Tom Harkin (center), of Iowa, meet June 6, 2012, with college interns on Capitol Hill in Washington as they call for action on averting a July 1 doubling of interest rates on federal college loans for students. (Associated Press)

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Sen. Jack Reed (left), Rhode Island Democrat, and Sen. Tom Harkin (center), Iowa Democrat, meet on Capitol Hill on Wednesday with college interns as they call for action on averting a July 1 doubling of interest rates on federal college loans for students. More than 30 million Americans are repaying student loans. (Associated Press)

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Sen. Tom Harkin, Iowa Democrat, as chairman of the education panel had promised a reform bill in the spring. He is expected to present his plan Tuesday. (Associated Press)