The 2005 and the 2010 referenda, featuring Mwai Kibaki and Raila Amolo Odinga as political rivals, produced two different and ultimately unsatisfactory results that explain the current agitation for another constitutional referendum.
The two had ganged up in 2002 through a power-sharing Memorandum of Understanding (MOU) whose intent was to make the presidency ceremonial and hand power to an unelected Executive Prime Minister. The base line was/is individualistic as to which political heavyweight gets what power and has little to do with the content of the document.