As PLDP was registered after nomination day for the 2006 general election, Ooi was not able to contest the election under the PLDP banner.
PLDP attempted to contest in the 2011 general election, with Ooi running for the Sengkang West Single Member Constituency. However, on Nomination Day, Ooi's assentor did not turn up,[1] leading to Ooi publicly appealing to the opposition's supporters to be his assentor but to be rejected by the crowd. He subsequently shed tears over again the inability to participate in elections, being in his 70s and having desired to become a Member of Parliament.