Assuming the polls are correct, Mexico’s notorious Institutional Revolutionary Party (PRI) will cruise to victory in Sunday’s presidential election and also win at least one chamber of the national legislature. Will this mean a return to the bad old days of authoritarian politics and corrupt deals with drug cartels, as many PRI critics fear? Or will it affirm the strength of Mexico’s young democracy and create a golden opportunity for economic reform?

Nobody can say for sure, but the second outcome seems more likely.