Roger Stone brings up a great point about Alvin Greene: the fact that his name begins with the letter "A" shows that he was very likely picked under the process he knows as "Aardvarking"
Yeah, this is why I don't think there's any big mystery about why he won. When you have a race between two candidates, and nobody knows who either candidate is, people will just pick on some "random" basis that isn't truly random, like "Greene sounds like a better name than Rawl." There doesn't have to be any deeper explanation than that.