Demographs and Politics

One thing that i have been wondering about involving demographics is how exact are they? because there are probably people who are not accounted for, or who are not U.S. citizens. i think it would be interesting to find out how exact they are.
The outcome of the presidential debates are strongly impacted by demographics, because the states with more young people and mixed races are more likely to support Obama, and older white people with conservative backgrounds are often McCain supporters. It also depends on the voting history of the state, and the amount of people who are registered to vote.


Presidential election 08 demographics