Former Manila Times publisher Chino Roces and former senator and opposition leader Jose W. Diokno supported the campaign boycotting the election.

The opposition's success was due in most part because of the public fallout after the assassination of Benigno Aquino Jr. on August 21, 1983.

The economy was also in crisis with severe poverty and debt dragging down growth, which was attributed to the Reagan administration's decision to distance itself from Marcos following Aquino's death, resulting in fewer investments that boosted the regime earlier before.

The gains from UNIDO, among other factors would force Marcos to call the for the 1986 snap presidential election, which would ultimately see him ousted following accusations of fraud, leading to Corazon Aquino becoming president.

After the assassination of opposition leader Senator Benigno Aquino Jr. in 1983, the opposition ran for the Regular Batasang Pambansa under the United Nationalist Democratic Organization (UNIDO) and the Partido Demokratiko Pilipino-Lakas ng Bayan (PDP–Laban) against the ruling Kilusang Bagong Lipunan of Ferdinand Marcos.