Here are some numbers regarding voter breakdown from POLITICO and PEW Research there are others.
Politico
http://www.politico.com/news/stories/1108/15297.html
By DAVID PAUL KUHN | 11/5/08 12:27 AM EDT
Excerpt:
Barack Obama, who will be the nation’s first African-American president, won the largest share of white support of any Democrat in a two-man race since 1976 amid a backdrop of economic anxiety unseen in at least a quarter-century, according to exit polls by The Associated Press and the major television networks.
Obama became the first Democrat to also win a majority since Jimmy Carter with the near-unanimous backing of blacks and the overwhelming support of youth as well as significant inroads with white men and strong support among Hispanics and educated voters.
The Illinois senator won 43 percent of white voters, 4 percentage points below Carter’s performance in 1976 and equal to what Bill Clinton won in the three-man race of 1996. Republican John McCain won 55 percent of the white vote.
Fully 96 percent of black voters supported Obama and constituted 13 percent of the electorate, a 2-percentage-point rise in their national turnout. As in past years, black women turned out at a higher rate than black men.
PEW:
http://pewresearch.org/pubs/1209/rac...ntial-election
Excerpt:
According to the exit polls in last year's presidential election, the candidate preference of non-white voters was distinctly different from that of white voters. Nearly all (95%) black voters cast their ballot for Democrat Barack Obama. Among Latino voters, 67% voted for Obama while 31% voted for Republican John McCain. Among Asian voters, 62% supported Obama and 35% voted for McCain. In contrast, white voters supported McCain (55%) over Obama (43%).