I really don't see much actual voting from the Occupy crowd, I'm kind of shocked that you have their participation so high. Very few actual young people choose to vote as compared with their total numbers.
Apply that to metalheads, etc.
Especially since not all Occupy protesters are young, and they're probably disproportionately political (aside from the homeless and anarchist types), a 10% turnout rate seems crazy low.
I also think a 90% non-voting rate by "Bob Marley fans" seems a little excessive...it's not all like they're pot-smoking losers, and besides, plenty of pot-smoking losers vote in Presidential elections; plenty of everyone do.
What exactly are you expecting youth VAT to be in this scenario (or are you including under-18s in your percentages)?
Teaparty isn't going to break for Mitt.
What odds are you willing to put on that?