During the the party's convention in Brasilia, Ana Amelia Lemos, of the conservative Progressistas Party, was chosen as the vice presidential candidate.
This marks the second time Alckmin is a presidential candidate. He ran in 2006 and was defeated in the second round of voting by then president Luiz Inacio Lula da Silva.
Ex-president Fernando Henrique Cardoso, said that Alckmin "is the man who can restore confidence in the economy" and "bring peace to the country's political climate."
According to a poll done in June, only 7 percent of voters favor Alckmin. He trails Lula, Jair Bolsonaro and Marina Silva.