Obi started his political career as a councillor, before becoming a local government chairman in
Delta State. During the first term of the former governor of Delta State
James Ibori, he served as the chairman, board of directors of The Pointer Newspaper which was owned by the Delta State government. In 2003, he contested and won a seat in the Delta State house of assembly, representing
Ika North East and served for three terms which ended in 2015. On 29 July 2010, he was elected as the 10th speaker of Delta State house of assembly to replace the 9th speaker Martin Okonta representing
Ika South constituency who was removed by the Court of appeal, Abuja on 12 May 2010. On 10 November 2010, he became the acting governor of Delta State after the Court of Appeal, Benin annulled the 2007 Delta State gubernatorial election that produced the governor of the state
Emmanuel Uduaghan. The Court of Appeal, Benin nullified the election on 9 November 2010 and ordered a re-run within 90 days. On 10 January 2011, Obi handed over to Emmanuel Uduaghan after he won the by-election that was held on 6 January 2011. On 7 June 2011, he was replaced by
Victor Ochei representing
Aniocha North constituency as the 11th speaker of Delta State house of assembly after he nominated him to replace him. He served as a special adviser in the first term of the governor of Delta State
Ifeanyi Okowa and left in 2019. Later in his life, he founded the Oracle of God Ministries Church, Asaba where he was the general overseer until his death. ==Personal life==