Joe Lieberman

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** FILE ** Sen. Susan Collins, R-Maine, the ranking member of the Senate Homeland Security Committee, right, accompanied by the committee's Chairman Sen. Joseph Lieberman, I-Conn., gestures during a news conference on Capitol Hill in Washington, Tuesday, July 24, 2012. (AP Photo/J. Scott Applewhite)

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Sens. Susan Collins, left, and Joe Lieberman have a private conversation on the dais during a hearing by the Committee on Homeland Security and Governmental Affairs in which United States Secret Service Director Mark Sullivan testified about the Secret Service scandal in Cartagena in which agents soliticted prostitutes. (Barbara L. Salisbury/The Washington Times)

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Sen. Susan M. Collins, Maine Republican, sponsored the Postal Service bill considered Wednesday with Sens. Joe Lieberman, Connecticut independent, Scott Brown, Massachusetts Republican, and Thomas R. Carper, Delaware Democrat. (Associated Press)

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Sen. Marco Rubio of Florida (right) talks about his views on foreign policy at the Brookings Institution in Washington on Wednesday. He is joined by Marvin Kalb (left), a Brookings guest scholar, and Sen. Joe Lieberman, a Democrat-turned-independent from Connecticut. He discussed his views on Iran and Syria. (Associated Press)

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"I'd say it's a reasonable question and that the White House ought to be conducting its own internal investigation of White House personnel who were in Cartagena, just to make sure that none of them were involved in this kind of inappropriate behavior," said Sen. Joe Lieberman, chairman of the Senate Homeland Security Committee. (Associated Press/CBS News)

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"To me, economic history proves that lower capital gains taxes grow our economy and higher capital gains taxes don't increase revenues." - Sen. Joe Lieberman, a Connecticut independent who usually sides with Democrats, missed the vote but said he would have opposed the tax.

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A bipartisan group of senators including (from the left) Susan M. Collins, Scott Brown, Joe Lieberman and Thomas R. Carper explain their bill to provide savings for the U.S. Postal Service, which would be used for employee buyouts, and delay for two years the proposed elimination of home delivery on Saturdays. (Associated Press)

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Joe Lieberman

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Sen. Susan Collins, Maine Republican, and Sen. Joe Lieberman, Connecticut independent, members of the Homeland Security Committee, were part of the debate Monday on presidential powers in the even of a cyber-attack on vital systems. (Associated Press)

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Sens. Susan Collins, Maine Republican, and Joe Lieberman, Connecticut independent, want information on federal grant funding of counterterrorism training and the standards that training has to meet to qualify for funding. (Associated Press)

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REPORT: Sens. Joe Lieberman and Susan Collins say that the Fort Hood massacre should have been prevented. (Associated Press)

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Senate Homeland Security and Governmental Affairs Committee Chairman Sen. Joe Lieberman, Connecticut independent, speaks Tuesday at a news conference on the release of a report on northern border security. The panel's ranking member, Sen. Susan Collins, Maine Republican, looks on. (Associated Press)

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Sen. Joe Lieberman, Connecticut independent (left) accompanied by House Speaker John A. Boehner of Ohio, speaks Wednesday during a news conference to explain the revived D.C. Opportunity Scholarship Program. (Associated Press)

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Sen. Joseph Lieberman, I-Conn., left, accompanied by House Speaker John Boehner of Ohio, gestures during a news conference on Capitol Hill in Washington on Wednesday, Jan. 26, 2011, to discuss the introduction of legislation on the D.C. Opportunity Scholarship Program . (AP Photo/Charles Dharapak)

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U.S. Sen. Joe Lieberman, Connecticut independent, accompanied by his wife, Hadassah, addresses a gathering Wednesday in Stamford, Conn. He has announced that he will not seek a fifth term in 2012. (Associated Press)

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Sen. Joe Lieberman, Connecticut Independent, pauses during applause as he announces that he has decided to retire and not seek a fifth term in 2012, in Stamford, Conn., Wednesday, Jan. 19, 2011. At left is Leiberman's wife, Hadassah. (AP Photo/Craig Ruttle)

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Senate Majority Leader Sen. Harry Reid, Nevada Democrat, from right, speaks as he stands with Sen. Joe Lieberman, Connecticut Independent, Sen. Mark Udall, Colorado Democrat, and Sen. Patrick J. Leahy, Vermont Democrat, at a press conference about the "Don't Ask Don't Tell" bill during an unusual Saturday session on Capitol Hill in Washington Saturday, Dec. 18, 2010.(AP Photo/Alex Brandon)

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Sen. Joe Lieberman and Sen. Susan Collins appear at a news conference after the defeat of a cloture motion of the Defense Authorization Bill containing repeal of the "don't ask, don't tell" provision on Capitol Hill. (Associated Press)