Although much has changed in the nearly four years since, How Barack Obama Won remains the essential guide to Obama's electoral strengths and offers important perspective on his 2012 bid.
The votes in each state for Obama and McCain are broken down by percentage according to gender, age, race, party, religious affiliation, education, household income, size of city, and according to views about the most important issues (the economy, terrorism, Iraq, energy, healthcare), the future of the economy (worried, not worried) and the war in Iraq (approve, disapprove).