Amani National Congress (ANC) leaders from Western have told former Jubilee steering committee chairman Noah Wekesa to stop marketing the Jubilee Party in the region.
They claim it has proven difficult to market the party in the region where Cord still enjoys support.
The leaders also said a proposal that the opposition forms a Super Alliance to challenge the Jubilee administration in 2017 was causing 'political diarrhoea' withing the ruling party.
The ANC officials who spoke to local media on Wednesday included Martin Soita (Bungoma), Julius Arunga (Kakamega) and Julius Ochiel (Vihiga).
Wekesa has been Jubilee's point man in Western selling the political outfit in the four counties of Busia, Bungoma, Vihiga and Kakamega.
Wekesa in an interview on KBC television on Wednesday downplayed opposition's ability to unseat Jubilee.
He said Mudavadi's presidential candidature cannot scare Jubilee if he became the coalition's flag-bearer.
He said if Mudavadi became the coalition's flag bearer, there would be disharmony in Nyanza and Eastern.
This, he said would work in favour of Jubilee.