% Change in Total Votes Cast for President 2004-2008
update: The WSJ numbers guy points out that the early look at the national turnout looks to not be a record, at least once you realize the national population has been going up. It's even far more complicated than that right? When you consider the baby boom generation is aging, and elderly vote more than other groups no matter what Tuesday's data shows... it really should be the case that voter participation is going to shoot up for the next couple decades. And none of that really begins to address different turnout rates across the country or the impact of ever-expanding early voting processes. Basically, the political scientists will be parsing all this for years to come.