 In 1956, he contributed to the electoral victory of Manuel Prado y Ugarteche, initiating the so-called "coexistence".Once again as presidential nominee, he placed first in the 1962 election, but the Armed Forces issued a veto against him, prompting a military coup that overthrew Prado and prevented his bidding to seal his victory in Congress in favor of former rival, Manuel A. Odría.During the Armed Forces Revolutionary Government, he assembled and instructed a new generation of party leaders, which included his successor and future president of Peru, Alan García.