Nine presidents in 10 years — the figure speaks volumes about the current state of Peruvian politics. On Sunday, voters will return to the polls. This time, they will choose between Keiko Fujimori , leader of the conservative Popular Force party, and Roberto Sanchez, the candidate for the left-wing Together for Peru. Whoever prevails at the ballot, Peruvians will vote in a climate of deep distrust of institutions, political fragmentation and growing concern over insecurity. For many observers,