Workers' Party (Brazil) the centre-right opposition bloc as it shrank from 133 to 111 deputies. The left-wing opposition, formed by PSOL, retained control of three seats. The party was also expected to elect its presidential candidate Dilma Rousseff in the first round. However, she was not able to receive the necessary amount of valid votes (over 50%) and a second round in which she scored 56% of the votes took place on 31 October 2010. On 1 January 2011, she was inaugurated and thus became the first female head of government ever in the history of Brazil and the first "de facto" female
Workers' Party (Brazil) His successor Dilma Rousseff, also a member of PT, took office on 1 January 2011. Both born from the opposition to the coup d'état of 1964 and the subsequent military dictatorship, PT and the Brazilian Social Democracy Party (PSDB) from 1994 to 2014 were the biggest adversaries in contemporary Brazilian politics, with their candidates finishing either first or second on the ballot on the last six presidential elections. Both parties generally prohibit any kind of coalition or official cooperation with each other. Despite its large number of supporters, the party has been involved in a number of corruption scandals since