Agreed, Nagpur need direct daily connectivity to Delhi. But please dont bring political issues like Separate Vidarbh State, etc.
Make strong Demand for train instead, Here in mumbai, Kutchi community has made strong demands for Another train to BHuj/Gandhidham & to add 1st AC coach in Sayaji & Kutch Express etc. & they got Couple of Weekly ,Biweekly service & one triweekly AC Sf too.
My Suggestion is write letter to Rail authority about direct train with strong influence from Local Politicians.