Why dont you look for MOASS.
In 2007 Kalonzo got 80 percent of Kambas.
Kibaki got 20 percent - possibly rigged.
As for Kambas - they make 95 percent of Kitui & Makueni -
85 percent of Machakos -
15-17 percent of Nairobi & Mombasa,Kwale and Taita Taveta -
5-10 percent of Kajiado (Mostly Athi river-Kitengela),Kiambu (Mostly thika), Kirinyanga (Mwea) and Embu (Mbeere South)
Kamba total vote is 10 percent - roughly 2.1m registered - with expected total cast of vote close to two million.
It's of course one of BIG 5 tribes in Kenya.