2008 Election: Young voters surge over 12 percent

2008 exit polls:

Young voters wer 18 percent of the electorate

2004 exit polls:

Young voters were 16 percent of the electorate

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What has gone un-noticed is that the increased participation of younger voters was at the expense of the middle aged 45-64 group, rather than what you would expect from older voters.

Older voters (over 65) were 16 percent in each election cycle.

The net effect of this is that extremely pro-Obama voters replaced more moderately pro-Obama voters.