Each one of the blue dots is a zip code, in which someone contributed $200 or more to President Obama's campaign in 2008, but haven't donated in this election cycle. The darker the dot, the more people in that zip code that have yet to re-up.
In '08, more than 550,000 people donated at least $200 to Obama's campaign. So far this year, 88% of those donors, or 537,806 people have not made another $200 commitment.
One thing is abundantly clear. While Obama may very well be elected to a second term, the level of passion and excitement about the presidential election has plummeted.