Alexis Tsipras promised voters an end to austerity and a new beginning for Greece. Will he deliver on that pledge? Greece's prime minister designate, Alexis Tsipras, has delighted his voters, scared the German government, and rattled the markets. The charismatic leader of the left-wing Syriza party, who won 36.3 percent of the votes counted in Greece's general election on January 25, now has a gargantuan task ahead of him. He has to deliver on the pledges he made to his voters when he promised an end to austerity. To do that, he has to persuade other eurozone members, notably Germany and Finland, to reduce Greece's public debt by a third. That debt stood at 175 percent of the country's gross...