La. Senate staffer suspended over Obama e-mail

http://news.yahoo.com/s/ap/20101201/ap_on_re_us/us_obama_e_mail

I really don't understand why people are offended by the email.
Can someone explain it to me?

Sure. It's sort of like this.

There are many, many old, locked threads that discuss racism in depth. I urge you to poke through the archives, because this isn't a topic we're ready to broach again.