Career
He belongs to Wiper Democratic Movement-Kenya and was elected to represent the Kangundo Constituency in the National Assembly of Kenya since the Kenyan parliamentary election, 2007. currently he is the CORD Alliance chief whip in the senate. Muthama is one of the hard stand politicians who have openly disagreed with jubilee government policies. He is affiliated to Kalonzo Musyoka, the presumed leader of kamba politics in Kenya
In early November 2013, Senator Muthama publicly announced that the government of Uhuru Kenyatta had withdrawn his security due to his stand over the ongoing cases in the international Criminal Court where Uhuru Kenyatta is facing trials.
Muthama categorically stated that he was not going to relent from speaking the truth.Muthama has been a case of controversial on goings.