Harry Potter "Order of the Phoenix" Trailer

Anyone remember the plot of this book? Something about an evil threat, but nobody will believe Harry or Dumbledore that it actually exists? Harry and his cohorts using fear of said threat to gain power among his peers. The leader of Hogwarts losing his position as Headmaster for insisting on claiming a threat existed and being replaced by someone who refuses to teach any real self defense lessons.

Who is this Rowlings lady, exactly? And what does Karl Rove have on her?