NIGERIA'S presidential frontrunner Bola Tinubu picked as his running mate a sitting Muslim senator and former governor of northeastern Borno state, the heartland of an Islamist insurgency that has killed and displaced thousands of people. The move by Tinubu, who is also Muslim, breaks with past practice where presidential candidates from major political parties have chosen running mates from a different religion in a bid to foster unity in the country. Tinubu, 70, was last month elected as the ruling All Progressives Congress party's candidate to succeed incumbent Muhammadu Buhari, who will step down next year after completing two terms. …