Note that Michael McDonald estimates that 41.6% of the voting eligible population turned out in the 2010 elections.
I know what you’re going to ask next, and so did Pew. The Pew Internet study (“Social Networking Sites and Our Lives”) also reports:
Controlling for demographic characteristics, internet users are nearly two and a half times more likely to have attended a political rally (2.39x), 78% more likely to have attempted to influence someone’s vote, and 53% more likely to have reported voting or intending to vote than non-internet users.
It’s true what they say, people who don’t use the Internet aren’t like you and me.