Sympathetic to leftist currents, Campero split from his family's party in favor of the Revolutionary Left Movement, serving in the Paz Zamora administration as general manager of the country's Central Bank and Stock Exchange.

His father was head of the party in Tarija, while on his mother's side, Campero was the nephew of Víctor Paz Estenssoro, the MNR's historic leader and founder, then serving his first of four eventual terms as president of the republic.

[7] He studied political economics in Chile during the family's exile there, and upon his return, attended the Bolivian Catholic University, during which time he played an active role in the anti-authoritarian student movement, in force during the country's democratic transition.

[8] Though some—like Campero's brother, Javier—accepted the new leadership and continued prosperous political careers within the MNR,[7] Fernando balked at the idea: "... it seem[ed] outrageous to me that the richest man in Bolivia could be head of the party that carried out the National Revolution.

The effort was only partially successful, with UN reaching agreements with Adrián Oliva [es], who won the governorship, while Tarija Mayor Oscar Montes ran his own campaign in the municipalities, conserving the capital mayoralty.

[20] Absent from the 2019 and 2020 elections as a product of UN's withdrawal from both contests, Campero concluded his term in parliament and retired to Tarija,[21] where he played a minor role in restructuring UN's regional alliances, this time backing Montes's gubernatorial aspirations over Oliva's reelection bid.