There are probably a lot who have never even seen this thread. They just like Skullgirls. There are plenty of people on the official forums who have even admitted to never playing the game, and that they just like the characters and tight design.
So yeah, everyone here is likely part of a vocal minority, and the majority vote is likely entirely obscured. There is simply no way to get an accurate poll. Especially due to the fact that there is also an entirely obscured voting block which makes up 35% of the total votes (which is to say, all the other countries that ARE NOT the US). These voters are actually the sway voters, so they are the ones who are likely to actually decide the vote, unless the winner has 50% or more of the votes. Well, more like 40-45% given for a margin error of 3-7%.