Mr Atwoli addressed the public at Mkunguni Square in Lamu County during a fundraiser in support of Lamu Women Sacco. He and Governor Joho presided over the event.
While noting that the referendum push was unstoppable, Mr Joho asked politicians, particularly those supporting 'team tanga tanga', to allow Kenyans to determine their destiny.
The governor praised President Uhuru Kenyatta and opposition leader Raila Odinga for reconciling through the handshake, saying it enabled Kenya to fight corruption.
"We need a country which is united and corruption-free. As for 'team tanga tanga', stop divisive politics. You should also be committed to the war against corruption," he said.
He added, “I was the biggest enemy of President Uhuru Kenyatta but currently, we’re friends. President Kenyatta and [ODM leader] Raila Odinga ... we are behind you on handshake matters."
Likoni MP Mishi Mboko said she was disappointed that some politicians were using the referendum to advance personal interests.
Ms Mboko called on Kenyans to support the push, saying a referendum would guarantee equality and fairness especially on matters leadership and governance.
“Governor Joho is our brother. We need him to feature in the next government as the President of this country. People in the Coast need enough representation in government,” she said.
At least Sh 11 million was raised at the fundraiser. Woman Representatives Elsie Muhanda (Kakamega), Asha Hussein (Mombasa), Ruweida Obbo (Lamu) and Kasipul Kabondo MP Eve Obara were present.