Bush DESTROYED Kerry in the 18-29 category in Mississippi. When I have time I can get you something pretty close to what really happened.
CNN's "exit polls" bear no relation to reality.
What evidence do you have that he DESTROYED Kerry?
Mississippi is 40% black, and I would guess (don't flame me if I'm wrong), that the 18-29 % of black people is higher because black people seem to have more kids. Young black people are more likely to turn out than older black people, so the % of the black vote is going to be much higher in the 18-29 age group than the total MS voters. Quite a few HS students even in the fascist place I live supported Kerry whilst their parents backed Bush. Kerry would've broken 40% in my high school (we didn't have an official poll, but the poll in our school newspaper was about 60-40), in one of the most conservative cities and counties in the state.
Whether or not Kerry broke 60% in MS, I dont know, but I definitely believe it's quite plausible that Kerry won the 18-29 group.