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Syriza's supporters celebrate their party's victory after the general election in Athens on September 20, 2015. Greek conservative leader Vangelis Meimarakis on Sunday conceded defeat in a general election that returned leftwing Alexis Tsipras to power. With more than a third of the vote counted, Tsipras' Syriza party was on 35.46 percent to New Democracy's 28.07 percent. AFP PHOTO / LOUISA GOULIAMAKI (Photo credit should read LOUISA GOULIAMAKI/AFP/Getty Images)