Cameroonians were set to vote on Sunday in a presidential election where incumbent Paul Biya, the world's oldest ruler at 92, is widely expected to maintain his 43-year grip on power despite an energized opposition pushing for change. Biya's opponents include former government spokesperson Issa Tchiroma, 76, who has drawn large crowds demanding an end to the veteran leader's long tenure. Tchiroma's bid has drawn endorsements from a platform of some opposition parties and civic groups. However, analysts say that Biya, in power since 1982, is likely to be re-elected given his firm control of state machinery and the fragmented nature of the opposition. His critics are still hoping he can be ousted after decades of economic stagnation and tensions...