By Caleb Bedillion Daily Journal TUPELO – A long-serving incumbent in a diverse ward faces a pair of primary opponents next week. Nettie Davis, 75, is a retired teacher completing a fourth term representing Ward 4 on the Tupelo City Council. Running as a Democrat, she hopes for a fifth term, but several other candidates have different ideas. DAVIS HUMPHREY RUFF In the Democratic primary, Gregory Humphrey, 60, and Tommy Ruff, a 60-year old car salesman, are both seeking to replace her. All three candidates will compete in the Democratic primary, which occurs next Tuesday.