sonko,kabogo,wanjiru won because their campaigns was well cordinated and money played a very critical role in that their constituents belive somebody with money does not need corrupt dealing with their cdf kitty to make the extra shilling.
Take HM for instance what he has done for people of KILOME is just commendable regardless of how he makes his money.
'......to the acknowledgment of the mystery of God, and of the Father, and of Christ; 3 In whom are hid all the treasures of wisdom and knowledge.' Colossians 2:2-3