AP and EG, you guys are are not taking into account the effect of Millennial displacement of Seniors dragging down the GOP vote among whites.
Remember as I calculated above, Whites going down to just 75% Republican, makes Mississippi a tie and the few exit polls we have show a massive skew towards Republicans among those 65 and older.
While that could happen, I don't think it's unreasonable to predict they will get more Republican with age. Taking the 18-29 or 30-39 age bracket numbers can have a high margin of error, even higher when broken down by race. There's also the possibility of Dem dropoff in the black vote by 5-10% that gets underestimated.