Other challengers are former anti-corruption chief Nuhu Ribadu and Kano State governor Ibrahim Shekarau, as well as 16 candidates from smaller parties. 
Washindani wengine ni aliyekuwa mkuu wa kitengo cha kuzuia rushwa Nuhu Ribadu na Gavana wa Jimbo la Kano Ibrahim Shekarau, kadhalika wagombea wengine 16 kutoka katika vyama vidogo vidogo.