In 1995, four people were murdered in Winona, Mississippi. The black man charged with their murders is now facing his sixth trial. Racial tensions helped lead to three convictions being overturned and two trials were deadlocked by hung juries. Tom Mangold visits the Deep South to investigate and to speak to those most closely involved. What he discovers says much about whether the high hopes of an increasingly race-neutral America are still justified at the close of the first year of Barack Obama's presidency.