In contemporary Latin America whenever there are successive free elections turnover tends to occur at every opportunity. That is, incumbent parties or coalitions seldom win; if they do, they almost invariably show diminished electoral support compared to that of the previous election.

The frequency of incumbent defeat seems especially remarkable in view of the traditionally strong Latin American presidency. The history of some Latin American countries has been replete with continuismo (the perpetuation of a president or regime in office through manipulation of formal constitutional procedures). Even in those polities with a record of frequent adherence to constitutional norms, the president has tended to be “strong,” at least compared to other governmental institutions, such as legislatures, courts, and state or local governments. Unsatisfied with the term “presidential,” in the North American sense, Jacques Lambert calls Latin American governments “regimes of presidential dominance” (Lambert, 1967).