Apparently John McCain thinks it's highly unlikely that someone in their twenties would vote for him - so unlikely in fact that he's willing to bet that the only reason a college-age person would be at one of his rallies would be to protest. It's probably true that a larger percentage of twenty-something voters in this country are liberal-leaning and likely prefer Obama, but McCain seems to take this as fact. Here's an interesting example of profiling not based on race, but based on age - and an assumed political leaning.
Pre-emptive Ejection (Iowa State Daily)
He certainly isn't winning any young votes with this one. One person ejected from the rally even stated that she had already early-voted for McCain. It must have been quite a slap in the face.