Even if Carson wins Iowa lets say, then Trump wins NH and also that block of southern states.
Carson better enjoy his IA win because it will be his only win.
After that, Trump will take NH and then SC and after that he’ll run the field.
Iowa is a coin toss. About half of winners get the nomination.
I have not seen Carson winning in any other state.
Carson has zero and I mean zero chance of winning the south.
“Even if Carson wins Iowa ...”
The caucus is in Feb ‘16 - plenty of time for things to happen.