That's what I thought at first, too.
The FAQ page explains the system. It's a tiered algorithm based mostly on the "Tipping Point States" stat from http://www.fivethirtyeight.com/ (which has been pointed out to be a site run by an Obama supporter). It should also be mentioned that the tiers are not up-to-date with the FiveThirtyEight stats. *shrugs*
How do we decide which states count more? First, we categorize states into the following...