Those who are praying bad prayer for Buhari are actually his so called supporters who are thinking that he may die before the end of his tenure if he wins and this will enable a repeat of the late President Yaradua incidence which will h pave way for their person to take over the Presidency.
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Also the two or three hidden men who are controlling him. They dont mind whether he is sick or not all they care about is what they are benefitting from him as a result of his ill health and incapacitation.

Another fl@thead analysis