Following is yet another installment of my weekly “Back Porch Chats” with the video folks at CineSport. This week it was Tara Petrolino asking me what the storylines are for the No. 5-ranked Georgia Bulldogs (3-0), who play host to Vanderbilt (1-2) on Saturday night at Sanford Stadium (7:45 p.m., ESPN2). . . .