The question is whether he has enough appeal to moderates and dissatisfied (w/hillary/obama) to attrack the votes necessary to win. I listened to his CPAC speech and imo his delivery lacked fire.
I have to agree with you. Duncan is a good, but not a great speaker, but I think he'd be a good doer. Maybe the Veep slot or another high profile assignment would give him the exposure he needs to get elected.