Leopoldo Raúl Guido Moreau was born on 5 November 1946 in Rosario, in Santa Fe Province, but grew up in San Isidro, in the Greater Buenos Aires conurbation.

In 1968, he was one of the founding members of the Junta Coordinadora Nacional, an inner youth current within the party, and the Franja Morada, the UCR's student wing.

[7] In 1995, Moreau was elected to the National Senate by the Legislature of Buenos Aires Province, where he became part of the parliamentary commissions on budget and treasury affairs, accords, culture and education.

[10] The economic crisis, the December 2001 riots and the subsequent resignation of President Fernando de la Rúa had all contributed to a considerable loss of support for the party, and on election day, Moreau received merely 2.34% of the popular vote.

[13] That same year, the MNA officialized its incorporation into the Front for Victory in an event in which President Cristina Fernández de Kirchner took part.

[14] At the 2017 legislative election, Moreau was the 8th candidate in the Unidad Ciudadana list to the Chamber of Deputies in Buenos Aires Province.

[17] During the 2020 debate, Moreau spoke on how his decision was influenced by the clandestine abortion practiced by his daughter Cecilia, a fellow member of the Chamber of Deputies.