Since 1938, two tendencies had begun to emerge in the ranks of the Republican Party, one revolving around the popular ex president Ricardo Jiménez Oreamuno and another around the young doctor and charismatic politician Rafael Angel Calderón Guardia.[3] Jiménez, however, an old man, would gradually leave power and influence, and the "Jimenismo" lost ground to Calderonismo, which also has full support from the government chaired by León Cortés Castro who pressures Jiménez into retirement.[3]
To prevent a triumph of the Calderonismo a coalition was tried between the Communist Party, a faction of the jimenismo and the Social Democratic Guanacastecan Brotherhood called National Democratic Alliance, nevertheless when Jiménez declines to be candidate this is broken so the parties that integrate it ran separately. During the National Republican Convention Calderón is selected presidential nominee and wins the elections.[3]