Presidential hopeful Sen. Barack Obama (D-IL) speaks during a May 23 rally in Sunrise, Fla. His mixed racial heritage, and the possibility that he may win the White House, has prompted many Americans to confront deeply held beliefs about racism.
                                            (Joe Raedle/Getty Images)

Letters: Race Relations, PTSD

Presidential hopeful Sen. Barack Obama (D-IL) speaks during a May 23 rally in Sunrise, Fla. His mixed racial heritage, and the possibility that he may win the White House, has prompted many Americans to confront deeply held beliefs about racism.

Credit: Joe Raedle/Getty Images