During the campaigning in the 1984 general election, SUF chief Seow was sued by Lee Kuan Yew (who was then the Prime Minister of Singapore) alongside the members of People's Action Party for slandering defamatory remarks made at two rally speeches that Lee and his cabinet were guilty of corruption.

They did not achieve much electoral success, as both saw the candidates losing their electoral deposits for failing to garner the necessary threshold of 12.5% of the valid votes cast (Soo Phuan in the 1997 election in Chua Chu Kang SMC and Lead Shake in the 2001 election in Ayer Rajah SMC).

[7] Pursuant to a Memorandum of Agreement signed in August 2015, Pwee and Hamim resigned from DPP to return to SPP to help their team contest Bishan–Toa Payoh Group Representation Constituency in the 2015 general election.

[8] On 19 February 2019, Pwee revealed that he had resigned from the DPP and joined the SDP ahead of the forthcoming general election four days later.

A statement dated 22 April 2013 on the DPP website states "The way forward is to build a society that is equal and egalitarian to all citizens."