[1] He earned a law degree from the National Autonomous University of Mexico (UNAM) in 1932 and, while a student, his political engagement began with his support for the unsuccessful campaign of José Vasconcelos in the 1929 presidential election.
[2][3] In the 1943 mid-term federal election he was elected to the Chamber of Deputies for the 2nd district of Aguascalientes[4] and, as president of the Chamber, he gave the official reply to President Manuel Ávila Camacho's third State of the Nation report later that year.
[6] He contended for the presidency as the PSD's candidate in the 1982 presidential election but placed seventh in a field of seven with 0.20% of the vote.
[8] In April 1987, at his ranch in Ocoyoacac, State of Mexico, Moreno Sánchez hosted a luncheon at which the formation of what was known as the "Democratic Current" (Corriente Democrática [es]) within the PRI was announced.
[3][1] Moreno Sánchez was married to Carmen Toscano (1910–1988), with whom he had four children:[8][1] Alejandra [es], a cultural historian whose positions have included director of the National Archives;[10] Carmen [es], a career diplomat who was appointed ambassador to Nicaragua in 2019;[11] Héctor, who was elected to Congress for the State of Mexico's 31st district in 1979;[12] and Octavio, who was elected to Congress for the State of Mexico's 3rd district in 1988.