2008 Delaware Democratic presidential primary

Barack Obama's win in the Delaware Democratic Primary can be traced to a number of factors. According to the exit polls, 64 percent of voters in the Delaware Democratic Primary were Caucasian and they favored Clinton by a margin of 56-40 compared to the 28 percent of African American voters who backed Obama by a margin of 86-9. Obama won all age groups except senior citizens ages 65 and over who strongly backed Clinton by a margin of 56-38. Obama also won middle class and more affluent voters making over $30,000 while Clinton won lower middle class and less affluent voters making less than $30,000. Obama also won higher-educated voters (college graduates 60-35; postgraduate studies 66-32) while high school graduates backed Clinton 51-44; both candidates evenly split voters who had some college and/or an associate degree 47-47. Registered Democrats favored Obama 54-42 while Independents also backed him by a margin of 50-44; he also won all ideological groups. Regarding religion, Obama won all major denominations except Roman Catholics who backed Clinton with a 60-35 margin – Obama won Protestants 51-47, other Christians 71-24, and atheists/agnostics 60-35.

Obama performed best in New Castle County, the most populous and urban part of the state which contains Wilmington as well as a large population of African Americans, which he won by a 56.49-39.69 margin of victory. He also narrowly won neighboring Kent County to the south, which contains the state capital of Dover, with 51.76 percent of the vote. Clinton won Sussex County in Southern Delaware, the more rural and conservative part of the state, with 52.73 percent of the vote.

• 2008 Delaware Republican presidential primary