With Obama choosing Charlotte, the speculation begins! Will this help him win North Carolina? Shouldn’t he have picked a different state? What about Virginia? Or Indiana? Or Ohio? Ad nauseum.
Generally, parties do not derive significant electoral benefits in states selected to host the national convention or those in which they control the governorship.
That bit about controlling the governor seems important too, especially since I recently sat at an off-the-record dinner at GW and listened to a very prominent Democratic pollster suggest otherwise.
UPDATE: See also the study cited by Jamelle Bouie.