A Question About Early Voters & Exit Polls

Should the media be releasing polls of people who've already cast their ballots? 

This could damage efforts to GOTV for either side, couldn't it? If polls, like this one, suggest that Obama is ahead, it could discourage McCain or third party supporters, and it could depress turnout of Obama voters who figure he's got it in the bag.

Sure, on election night we start getting results from exit polls before the voting on the west coast concludes. In that situation, however, exit polling might impact only about three hours' worth of voting. We've still got seven days to go.