[1] His father, Julio Mera Figueroa, was active in politics and served as Interior Minister during the presidency of Carlos Menem from 1990 to 1991.

[4] In the 2009 legislative election, Mera was the first candidate in the Front for Victory list to the National Chamber of Deputies, followed by Rubén Yazbek.

Two years later, in 2011, he was the running mate of Lucía Corpacci to the governorship of Catamarca: the Corpacci–Mera ticket received 49.5% of the vote, and he was sworn in on 10 December 2011.

[7][8] Following the 2019 general election, Mera formed part of the Frente de Todos bloc alongside most other peronist senators.

[1] He was an opponent of the legalisation of abortion in Argentina, voting against the two Voluntary Interruption of Pregnancy bill debated by the Argentine Congress in 2018 and 2020.