LIMA, Peru—When Martin Vizcarra stepped up from the vice presidency to replace the disgraced Pedro Pablo Kuczynski as president of Peru in March 2018, the odds appeared stacked against him. An austere, accidental leader whose tiny political party, Peruvians for Change, controlled a fast-disintegrating congressional bloc, Vizcarra immediately came under heavy fire from the hard-right Popular Force party, led by Keiko Fujimori, which had seized on a bribery scandal to force Kuczynski to resign. After three months of attempting to appease the Fujimoristas—and seeing his approval ratings plummet—Vizcarra launched a make-or-break campaign against Peru’s rampant corruption, and by implication Popular […]