Partido dos Trabalhadores (PT)

Reference works classify it as centre-left. Luiz Inácio Lula da Silva is its honorary president and Edinho Silva its president. It holds 64 of 513 seats in the Chamber of Deputies and 9 of 81 in the Senate. It is named in the market on which party holds the most seats after the 4 October 2026 Senate election.

History

The party was founded in 1980 and was launched under a democratic socialism trend, long defining itself as socialist. Wikipedia describes its later shift to social democracy, with some members keeping left-wing positions. It won the presidency in 2002, 2006, 2010, 2014 and 2022. Between 2003 and 2007 it expelled dissident legislators, who went on to form rival parties. Its support fell sharply between 2015 and 2020 and recovered with the 2022 election, which returned Lula to office. It is strongest in the North and Northeast of Brazil.

Summarised automatically from the linked sources. Wikipedia