He accused Jubilee of marginalising the region for not supporting it's ideologies.
The President and his deputy William Ruto are expected to lead a high-powered team to Kisii and Nyamira on Tuesday and Wednesday respectively to launch various projects and to campaign for his re-election, hoping to wrest the region from the Opposition's grasp.
But Mr Bosire said nothing would change the peoples' minds to support Jubilee.
The Head of State is keen on winning opposition strongholds: Coast, Gusii and Western.
Last week he concluded his vote-seeking tour in Coast and will later camp in western Kenya for the same agenda.