When Mexico's authoritarian Party of the Institutional Revolution (PRI) was defeated in the 2000 presidential election after seventy-one years of uninterrupted rule, many analysts believed the party would inevitably splinter and collapse. An authoritarian party without control over government resources and without a strong national executive creates both opportunity and incentive for ambitious politicians to leave the party and join a separate faction. To the surprise of many, however, the PRI managed to deviate from this pattern, and returned triumphantly to the presidency in 2012....

When Mexico's authoritarian Party of the Institutional Revolution (PRI) was defeated in the 2000 presidential election after seventy-one years of uninterrupted rule, many analysts believed the party would inevitably splinter and collapse. An authoritarian party without control over government resources and without a strong national executive creates both opportunity and incentive for ambitious politicians to leave the party and join a separate faction. To the surprise of many, however, the PRI managed to deviate from this pattern, and returned triumphantly to the presidency in 2012....