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During their time in the Senate together, Arizona Sen. John McCain, Connecticut Sen. Joe Lieberman and South Carolina Sen. Lindsey Graham became close friends.Paul J. Richards—AFP/Getty Images
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The three Senators, shown here in 2009, often appeared at each other's press conferences.Chris Kleponis—Getty Images
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Shown here on a trip to Baghdad in 2006, the Senators were known as "the three amigos," after a 1980s comedy starring Steve Martin, Chevy Chase and Martin Short.Khalid Mohammed—Pool/Corbis
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Though they have different temperaments, the three Senators have an easygoing rapport that's clear when they are together, as in this 2008 walk-through of the GOP national convention stage.Sacramento Bee/MCT/Getty Images
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The three amigos, shown here at a White House summit in 2009, have something else in common: They've all run for president.Kevin Lamarque—Reuters
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Lieberman ran for vice president in 2000 alongside Al Gore then mounted his own unsuccessful bid for the nomination in 2004.Jason Reed—Reuters/Corbis
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McCain made an unsuccessful primary run in 2000 and then became the GOP nominee in 2008, where he was often accompanied by Lieberman and Graham on the campaign trail.Mauricio Duenas—AFP/Getty Images
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The three Senators watched the Super Bowl in a hotel lobby bar during the 2008 campaign.Charles Dharapak—AP
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Graham and Lieberman were with McCain as he barnstormed in the final 24 hours of his 2008 presidential campaign.Ethan Miller—Getty Images
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They even accompanied him on a campaign trip to Amman, Jordan, in 2008.Nasser Nasser—AP
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Graham is now readying his own bid for the Republican nomination in 2016.Alex Brandon—AP
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Though Lieberman is a Democrat-turned-independent and Graham and McCain are Republicans, the three Senators, shown here on a 2010 trip to Afghanistan, share similar views on a muscular foreign policy.Ahmad Masood—Reuters/Corbis
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The three Senators, shown here laying a wreath at the Yad Vashem Holocaust museum in Jerusalem, also share strong support for Israel.Yehuda Raizner—AFP/Getty Images
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After Lieberman left the Senate in 2013, McCain and Graham, shown here greeting former Secretary of State Henry Kissinger, continued to work together.Tom Williams—CQ-Roll Call/Getty Images
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But they'll always be remembered as the "three amigos."Scott J. Ferrell—CQ-Roll Call/Getty Images
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