Most of the coaches delegate their vote to the Sports Information Department. Seriously, they don't have time to mess with that stuff. If the coach gets involved at all, its towards the end of the season.
I really don't care about the polls at all this year, since the Committee of 13 is going to release its own Top 25 at the end of this month. But I really, really don't know why we have a coaches poll this year. The schools have agreed to crown the champion on the field, so why are the coaches even voicing an opinion in the matter?