Head of Greece's radical left-wing Syriza party Alexis Tsipras casts his ballot at a voting center in Athens, Sunday, June 17, 2012. Greeks voted Sunday for the second time in six weeks in what was arguably their country's most critical election in 40 years, with the country's treasured place within the European Union's joint currency in the balance. (AP Photo/Petros Karadjias)
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