Nobody knows who they are or where they are or if they're going to vote. Ideally, you'd have to run a multi-city campaign in Baton Rouge, Dallas, Houston, Atlanta.
It's expensive enough to advertise in metropolitan New Orleans, but if you have to add in Baton Rouge, Lafayette, Houston and Atlanta, you might as well run for president. I don't know what the answer is. And, of course, for direct mailing, they don't have their addresses.