SAO PAULO (Reuters) – Former President Luiz Inacio Lula da Silva, who is leading in the polls for Brazil’s October presidential election, said on Saturday he will not tolerate threats against institutions, and that the armed forces need to commit to democracy. “It is necessary to overcome authoritarianism and anti-democratic threats. We will not tolerate any kind of threat on the institutions that represent the popular vote,” Lula said in a speech in the northeastern city of Salvador. Three other presidential candidates also attended the event to celebrate the independence of the State of Bahi…