In 1950 he was elected a UDN party representative for the state of Rio in the Chamber of Deputies.
Up to 1965, there were three main parties in Brazil: the left-wing populist Brazilian Labour Party (PTB), the liberal Social Democratic Party (PSD) and the conservative National Democratic Union (UDN).
Two of them were pro-Vargas — the Brazilian Labour Party (Partido Trabalhista Brasileiro, PTB) to the left and the Social Democratic Party (Partido social Democrático, PSD) in the center — and another anti-Vargas, the rightist National Democratic Union (União Democrática Nacional, UDN).
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The liberal and rightist parties of the opposition against Vargas created the National Democratic Union.
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The right-wing National Democratic Union (UDN), noted for its radical anti-Vargas posture, once again nominated Eduardo Gomes as its candidate.