In northern Nigeria, opinions are split on President Buhari In Kano, a large commercial city in northern Nigeria, opinions are split over the record of Muhammadu Buhari, incumbent president and candidate for re-election on February 16. Some residents have already made up their mind to vote for his main rival, Atiku Abubakar. Kano, with its 15 million inhabitants, is a key area for the presidential candidates. IMAGES of markets in Kano AND SOUNDBITES of Kano residents and traders