Oparanya said supporting Mudavadi was the only sure way to send the Jubilee administration home come the August 8 2017, General Election.
He added in an address in Webuye on Tuesday, that the community can now solve its problems and get political direction ahead of the poll.
Mudavadi was crowned the community's spokesman at a colourful New Year's Eve ceremony led by Cotu Secretary General Francis Atwoli.
Oparanya said those opposing the appointment will be perceived as enemies of the community.
"Others are saying that it wasn't to be Mudavadi... We are beyond that. We want unity for our community," he said.
The Governor asked leaders from the region, who have opted to back Jubilee, to reconsider their steps and return to the community's fold.
"We are appealing to the lost sheep of our community, who are blinded by Jubilee goodies, to come back so that we move ahead as one," said Oparanya.
He further urged Water Cabinet Secretary Eugene Wamalwa and Bungoma Governor Kenneth Lusaka to join them for the election.
"The Luhya community [has faced serious discrimination] by this regime in terms of development. We need to elect a new regime that will serve Kenyans without bias," he said.
The Governor downplayed the recent revival of Pan Paper Mills saying: "The factory had been bought by the same people who revived it at a price that we cannot accept."
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