After its Bauchi governorship candidate resigned, the Nigeria Democratic Congress said the APC was luring its candidates with money and appointments and promised to replace anyone who leaves.
President Tinubu, NDC presidential candidate Peter Obi and Kano Governor Abba Yusuf paid tribute to Rabiu Musa Kwankwaso, now Obi's running mate, as he turned 70 on 21 October.
Nigeria's biggest northern state has changed ruling parties four times, decided one election by fewer than 9,000 votes, and sent another all the way to the Supreme Court.
