Our last national poll finds the same thing every other poll does. Very excited voters favor Republicans on the generic Congressional ballot 50-38. But Democrats lead 53-35 with somewhat excited voters and 45-27 with not very excited voters, giving them an overall 43-41 lead.
So which number matters more- the overall one or the one among highly enthused voters? Let's look at a few of the races we've already had this cycle:
-In the special House election in Pennsylvania last month our polling found Republican Tim Burns up 60-38 with very excited voters. He trailed 50-46 with somewhat excited voters and 53-37 with not very excited voters. Burns lost the election because the Democrats, excited or not, still turned out.
-In the Massachusetts Senate race Scott Brown led 59-40 with very excited voters, trailed 60-35 with somewhat excited ones, and trailed 61-31 with not very excited ones. He won but those folks who said they weren't very excited still showed up and kept his margin of victory to 5 points.
-In the New Jersey Governor's race Chris Christie lead 60-34 on our final poll with very excited voters, trailed 44-42 with somewhat excited ones, and tied at 39 with not very excited ones. Like Brown he won, but it was only by 4 points and nowhere close to the 26 point lead he showed with very excited voters.
http://publicpolicypolling.blogspot.com/2010/06/thoughts-on-enthusiasm-gap.htmlp.s.
furthermore I'm convinced democrats could have won the MA special Senate election had we had a fully engaged nominee.