Coast used to belong to KANU/Moi - except pockets of Mombasa which are comspolitan.
In 2002 with Uhuru selection to fly KANU - coast become angry - not only was Ngala overlooked but a Kenyatta who was responsible for their land troubles was picked.
Raila quickly shifted to Majimbo - attracting Coast and Rift valley in 2007.
Coast therefore has belong to Raila since circa 2005.
Militant side of coast were with Raila - the other part are any gov in power.
Ruto is keen to inherit the Raila side and of course the any gov in power.
I think he will do it - next election Ruto will carry coast completely.