POLITICAL tension heightened in Edo state yesterday as the Deputy Governor of the state, Dr Pius Odubu, vowed to sue the Peoples Democractic Party (PDP) governorship candidate in the last gubernatorial election in the state, Gen Charles Airhiavbere, for libel. Odubu's grouse was over the allegation that a man who slumped at the state governorship election petition tribunal sitting on Thursday was brought by him (The Deputy Governor) to perform 'some dubious mission'.