I contacted Miller Brewing, who distributes Presidente in the U.S. I also met with a representative from Phillip-Morris (parent-company) and asked them why the limited distribution. Their reason/excuse was capacity issues. They said they were quite confident they could sell the beer to expanded markets, including the general gringo populace, but they were not prepared to introduce it on a wide scale.
I have been frustrated that I can't get it in Ohio, either.
Anecdote: I remember the first time I had a Presidente. It was long before I knew anything about the Dominican Republic or had ever been. I was in a grocery store in Miami looking for beer and decided to try something different. "Damn! This is good beer!" I thought when I drank it later that night. I loaded my dad's minivan up with it on one road trip from Miami on our way back to Ohio. He became very suspicious I had some kind of drinking problem.