Alexis Tsipras

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Alexis Tsipras, head of the left-wing Syriza Party, waves to his supporters in Athens late Sunday. The party won 72 seats in parliament. (Associated Press)

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Alexis Tsipras, leader of Greece's radical left-wing Syriza party, casts his ballot at a voting center in Athens on Sunday, June 17, 2012. (AP Photo/Petros Karadjias)

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Alexis Tsipras, head of Greece's Radical Left Coalition, presents his party's economic policies in Athens on June 1, 2012. (Associated Press)

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Alexis Tsipras, leader of Greece's Radical Left party, arrives for a meeting of political party leaders at the Presidential Palace in Athens on Wednesday, May 16, 2012. (AP Photo/Thanassis Stavrakis)

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Greek President Karolos Papoulias (center), socialist leader Evangelos Venizelos (first left) conservative leader Antonis Samaras (second left) and leftist leader Alexis Tsipras (right), meet Sunday in Athens. They failed make a deal for a coalition government. A Monday meeting is in doubt because Mr. Tsipras balked at the proposal. (Associated Press)

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Greek President Karolos Papoulias (center), socialist leader Evangelos Venizelos (left), conservative leader Antonis Samaras (second from left) and leftist leader Alexis Tsipras (right) meet on Sunday, May 13, 2012, in Athens. (Associated Press)

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Alexis Tsipras, leader of Greece's Coalition of the Radical Left party, or Syriza, speaks to reporters after meeting with Socialist leader Evangelos Venizelos at the Greek parliament in Athens on Friday, May 11 2012. (AP Photo/Kostas Tsironis)

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"This is a historic moment for the Left and the popular movement and a great responsibility for me," says Alexis Tsipras, leader of Greece's Radical Left Coalition party that won 16.8 percent of the vote in Sunday's national election. (Associated Press)