Obi scored 61 votes to defeat the APGA presidential candidate, who scored zero votes.
The particular polling unit is populated with civil servants, government functionaries and others.
Obi won despite the fact that Governor Chukwuma Soludo had directed the civil servants to vote for APGA during a retreat in December 2022.
The Peoples Democratic Party also got two votes, while the All Progressives Congress scored zero votes.
For the Senate, the senatorial candidate of LP, Chief Victor Umeh scored 49, Dozie Nwankwo of APGA scored eight, Uche Ekwunife of PDP scored five and APC scored one.
For the House of Reps, LP candidate, Lilian Orogbu, 51; APGA seven; PDP four; zero for APC and one invalid vote.
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