Mr Kashamu, lawmaker representing Ogun East at the Senate, had been at Loggerheads with Ladi Adebutu, another factional governorship candidate of the party.
There were reports at an event held last year that the body endorsed Mr Abubakar, a former vice president popularly known as Atiku, as its candidate for the February 16 presidential poll.
Mr Mbaka, a Catholic priest, had on Tuesday endorsed Mr Buhari who is seeking a second term in office on the platform of the All Progressive Congress, (APC).
At the event, Mr Ngige described the Peoples Democratic Party (PDP) and its candidates as "deceivers."
Mr Mbaka, a Catholic cleric, made this known on Tuesday while delivering his new year speech at his ministry.