He was supposed to appear at a NAACP-sponsored forum, but he cancelled out saying that he would be appearing with Barack Obama instead. However, as Santorum Blog points out, Obama was in California at that time. Oops - rather a stupidly chosen lie, don't you think?
And the blog shows, Casey has a history of joining the NAACP in election years and then letting his membership lapse when the election is out of the way. Do they enjoy being used as long as it is by a Democrat?