I was in Kenya just after this, when Miguna Miguna went missing for a few days (people feared he had been disappeared,but he "just" got deported). As chance would have it, I was in his home town. Quite heavy demonstrations - makeshift roadblocks with burning tires, and they raided a beer truck, and the police did crowd control by shooting into the air.
I was in Kenya in 2007 as well when the same opposition candidate also lost the election. That was much, much uglier. While I do sympathise somewhat with his followers (the region he is from is much poorer than central Kenya, and this follows tribal lines - they feel they are not being heard, and there is some truth to that), I do think that this candidate is a quite dangerous man to have in power. Any influence he has now is coming from the fact that his followers will tear the country up if he says so - and he did say so back in 2007.
Kenyan politics is a bit of a mess I'm afraid..