According to a poll conducted by the Pew Research Center (pdf), 63 percent of Americans believe blacks are responsible for their own inability to succeed.
Those polled ranged from those who identified as "solid liberals" to those who identified as "steadfast conservatives." They were asked whether they believed that "racial discrimination is the main reason why many black people can't get ahead these days" or "blacks who can't get ahead are mostly responsible for their own condition."
Overall, Americans' views varied greatly depending on their political leanings, the study found. More than 80 percent of those who identified as "steadfast conservatives" believed that blacks are responsible for their current station in life, while more than 80 percent of those who identified as "solid liberals," which Pew defines as "generally affluent and highly educated" and who " … vote Democratic and are unflagging supporters of Barack Obama," believed that racial discrimination plays a role in holding blacks back.
View the poll and research at the Pew Research Center (pdf).