KARNATAKA: Coming from a political family and canvassing for Congress candidates for two decades and more in the past elections here, Prabha Mallikarjun is making her electoral debut in this Lok Sabha constituency. And interestingly, for the first time, Davangere will see a contest between two women -- Prabha is taking on BJP's Gayathri Siddeshwara. The 48-year-old Prabha, a dentist, …