http://www.slate.com/id/2183053/ A recent example was carried out by economists Sendhil Mullainathan and Marianne Bertrand. They generated about 5,000 fake job applications and used a computer to add, at random, distinctively black or white names. The employers who received the applications systematically favored the Gregs and the Emilys over the LaTonyas and the Jamals. Perhaps even more perniciously, they paid attention to the qualifications of (apparently) white applicants, but did not notice the difference between mediocre black applicants and excellent ones.
http://papers.ssrn.com/sol3/papers.cfm?abstract_id=422902 Based on the abstract, it looks like a solid and persuasive study to me.
Would a President Barack Obama help change attitudes?