[The Conversation Africa] Tanzanians will head to the polls on 28 October in which the incumbent, John Magufuli, faces a determined opposition. Elected to a first term in 2015, Magufuli's time in office has lived up to his nickname tinga tinga, Kiswahili for "the bulldozer". He has been applauded by some for advancing a series of major developmental projects. Others have denounced him for his arguably more autocratic, repressive rule