Electoral-vote.com has interesting analysis of the exit polls (emphasis added):
The NY Times has the exit poll data. Obama barely won among men (49% to 48%), but strongly among women (56% to 43%), overwhelmingly among blacks (95% to 5%), and convincingly among Latinos (66% to 31%) and Asians (62% to 35%). However, he lost among whites (43% to 55%) as Democrats normally do. He did progressively worse with age, winning the 18-29 year-olds 66% to 31% but losing seniors 52% to 46%. He swept every educational category as well as Catholics and Jews but lost Protestants 54% to 45%. He won people living in big cities, small cities, and suburbs, but lost in small towns and rural areas. One is tempted to say McCain won in traditional 19th century America (what Sarah Palin would call "real America"): older white Protestant men living in small towns. Obama won everywhere else. The Republican Party is going to have to think long and hard if it wants to hitch its wagon to this fading star while the Democrats are going after younger, multicultural, urban voters.