I just found this:
Events on July 22, 2007
Barack Obama
Time N/A, Speech in Miami Beach, FL.
Time N/A, Appearance in Chicago, IL.
Appearance
Participating Candidates
Barack Obama
Event Details
Date: July 22, 2007
Time: N/A
Location: Chicago, IL
Speak to La Raza from 1;30 to 3PM Miami time, hop a private jet, what 2 1/2 to 3 hour flight to Chicago, I think you gain an hour, meet Michelle at the church at 6 Chicago time, very doable.
So it seems that even if Obama did miss out on this racist sermon, he attended a racist La Raza conference. La Raza is the racist Mexican-Hispanic group whose motto is ""For La Raza todo. Fuera de La Raza nada," (For those of the race, everything; for those outside the race, nothing.)
Either way Obama was with racists.