hillary rodham clinton's narrow win in the indiana democratic primary can be traced to a number of factors. according to exit polls, 78 percent of voters in the indiana democratic party were caucasian and they opted for clinton 60-40 percent compared to the 17 percent of voters who were african american who backed obama by a margin of 89-11. obama won young voters under the age of 40 by a margin of 59-41 while clinton won older voters over the age of 40 by a margin of 58-42. the results varied according to socioeconomic class in indiana. obama won extremely poor voters with less than a $15,000 family income by a margin of 58-42. clinton won middle class voters with family incomes of $15,000-$75,000 by a margin of 53-47. obama won upper middle voters with a family income of $75,000-$100,000 by a margin of 51-49 while clinton won more affluent voters with incomes of over $100,000 by a margin of 54-46 percent. clinton won less educated voters (high school graduates backed her 54-46 while those with some college and/or an associate degree supported her 55-45) while obama won more educated voters (college graduates and those with postgraduate studies both backed him 56-44). clinton won self-identified democrats, who made up 67 percent of the electorate, by a margin of 52-48 as well as self-identified republicans, who made up 10 percent of the electorate, by a margin of 54-46; obama won independents, who made up 23 percent of the electorate, by a margin of 54-46. obama won voters who identified themselves as liberal while clinton won voters who said they were moderate and/or conservative. regarding religion, clinton won protestants by a margin of 51-49 percent along with roman catholics by a margin of 61-39 percent; obama won voters who identified with other religions by a margin of 60-40 as well as atheists/agnostics by a margin of 57-43.