Uh no, college students were NEVER "counted" because pollsters can't call dorm phones as far as I know. And the ones that live off-campus, in my experience, tend to be more Republican anyway.
But, I don't know many young cell-users... young people talk a lot, and cells cost a lot. On the other hand, my parents and grandma and I all are cell-only... and we're all Bush-only. It seems to me that travelling businessmen types are far more likely to be cell-only, anyway.