Leaders of the Kenya Kwanza ethnic group in the Western region promised to back Ruto with 70% of the vote to oust ODM leader Raila.
The UDA is led by Ruto, but relations with the ANC, which is led by Musalia Mudavadi, are hostile, particularly in Kakamega county.
In contrast to Cleophas Malala, who is running to succeed Wycliffe Oparanya as governor, Bonny Khalwale is running for the Kakamega senate seat on the UDA ticket. ODM candidate Fernandes Barasa is Malala's opponent.
On Sunday at Kakamega, Kenya Kwanza was headed by Musalia. Along with Khalwale and Malala, he was surrounded by influential people.
Despite hearing boos from the large crowd, Khalwale counselled Mudavadi to focus on the presidential election rather than regional politics.
It's not unusual for Khalwale and his ANC friends to disagree in Kakamega county. Khalwale had previously argued that Malala and Barasa were both capable and deserving of public scrutiny while he was running for governor in Matungu.
Political analysts predicted that DP Ruto would suffer from the Western sibling disputes in the final days before the election.
When fighting to reduce Kenya Kwanza's influence, Raila's friends in the West are not taking any chances. On Saturday and Sunday, Raila's support was boosted by Busia County Governor Oparanya Barasa.
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