He garnered 15% of the vote in an election that many considered suspect due to massive state support for the government-endorsed candidate, Hernán Siles Zuazo. FSB lost momentum after the 1959 assassination of Únzaga.
He garnered 15% of the vote in an election widely seen as tainted by widespread government backing for the favored candidate, Hernán Siles Zuazo. Following Únzaga's assassination in 1959, FSB lost its footing.