Institutional Revolutionary Party
Cárdenas's successor Manuel Ávila Camacho gave the party its present name in 1946. The party, under its three different names, held every political position until 1946 when the PAN started winning posts for municipal president and federal deputies and senators, starting in 1946, after the party changed its name to its current name, the Institutional Revolutionary Party. By then, the party had acquired a reputation for corruption, and while this was admitted (to a degree) by some of its affiliates, its supporters maintained that the role of the party was crucial in the modernization and stabilization of Mexico.
Plutarco Elías Calles
Under Calles's rule in 1926, a constitutional change was passed that allowed for a non-consecutive re-election, and in 1928 Obregón was elected as Calles's successor; this amendment was later repealed in 1934. In addition, Mexico passed an amendment to the constitution in 1927 that expanded a presidential term from four years to six years. However, Obregón was murdered by José de León Toral, a Catholic militant, before he could assume power. To avoid a political vacuum, Calles named himself "Jefe Máximo", the political chieftain of Mexico and Emilio Portes Gil was appointed temporary president, although in reality he was little more than a puppet of Calles. The following year, Calles founded the National Revolutionary Party (, PNR), the predecessor of today's Institutional Revolutionary Party (, PRI).