Peru’s recent history of presidential elections advises caution when the margin is measured in tenths of a percentage point. If anyone knows this better than anyone else, it is Keiko Fujimori, who lost by a hair to Ollanta Humala in 2011, to Pedro Pablo Kuczynski in 2016 and to Pedro Castillo in 2021. That is why, although an exit poll currently gives a slight edge to the leftist Roberto Sánchez —50.3% to 49.7%— the presidential runoff remains open in a race to choose the country’s ninth leader