Their customer base also excludes most of Obama's younger voters. I think the age demographic will be a bigger factor than race, come election day.
Don't make too much of that. All you need is an AOL Instant Messenger account, not one of the paid internet access accounts. This means a user could in theory vote more than once for free, but it's probably unlikely. Also, lots of younger people have AIM accounts; it's only tapered off among college students within the past couple of years.