The exit polls generally count Hispanic as a separate category from White. This would lead to a difference of a few points versus the census figures in AL and MS, and a larger difference in GA, wouldn't it?
In all of my calculations, I broke down the projections by race, including Latino, Asian, Nat-Am, "Other" and so forth. Georgia in particular was quite easy, since turnout data by race in all of these categories is kept on file with the SoS. In MS & AL, I had to project but I used two tables of Census data (the one that includes non-Hispanic white as "White" and the one that shows Hispanic/Non-Hispanic by origin) that helped me split apart each group along the same lines.
In AL, Latino + other are 7.1% in the 2013 Census estimates. They were only 3% of voters?