A Greeneville minister has announced his bid to unseat Gov. Bill Lee.Democratic candidate Dr. Casey Nicholson, a Tennessee native, is an ordained Cumberland Presbyterian minister.Nicholson served as Chair of the Greene County Democratic Party from 2017 to 2019. He also served as the representative for the 1st Congressional District to the Tennessee Democratic County Chairs Association from 2017 to 2019.He earned undergraduate degrees from Walters State Community College and East Tennessee State University.