USA Today has come up with 6 categories of voters who, it claims will "decide the election". Let’s take a look.1. True believers: 30% of the electorate - they break down 65% Obama, 33% McCain. 2. Fired up & favorable: 14% of the electorate - they break down 65% Obama, 35% McCain.3. Firmly decided: 12% of the electorate - they break down 48% Obama, 50% McCain.4. Up for grabs: 18% of the electorate - they break down 36% Obama, 41% McCain.5. Skeptical & downbeat: 12% of the electorate -...