They really just make shit up. That fact never ceases to amaze me.
Case in point: look at the youth vote. According to this poll from Invester Business Daily (ahem), John McCain wins the youth vote (18-24), 74-22. Yeah, that's right. 18-24-year-olds are really loving McCain, 3-to-1 over Obama. It's all they can talk about. Oh, wait, what's that asterisk on that line? "Age 18-24 has much fluctuation due to small sample size."
It's just a self-contained little fantasy world this group lives in.