Former Sao Paulo state governor Jose Serra (R) and former Minas Gerais state governor Aecio Neves attend the ceremony to launch Serra's presidential candidacy by the ruling Brazilian Party of Social Democracy, in Brasilia April 10, 2010. Brazil's main opposition parties on Saturday endorsed Serra of the centrist PSDB party as their presidential candidate in October general elections. REUTERS/Ricardo Moraes (BRAZIL - Tags: POLITICS ELECTIONS)