The seat for the riding of Kent officially became vacant last week after Graham quit politics.
Liberal Leader Brian Gallant will run for the party and the Progressive Conservatives will choose their candidate on Wednesday. Graham resigned after he was found to be in a conflict of interest over a $50-million loan guarantee his government gave to a construction firm in 2009.
The province's conflict of interest commissioner said Graham should have removed himself from the cabinet discussions about the loan guarantee to Acton because it had ties to his father.
