What was the demographic breakdown of the 2008 Presidential election I.e. what percentage of blacks voted What percentage of Hispanics voted What percentage of whites voted etc?

It will be several weeks before data is aggregated & processed, but the VOTING stats suggest that 2008 US electorate (not the population!) was

73% "White"

9% "Hispanic"

2% "Asian"

3% "Other"

13% "Black."