Somebody correct if I'm wrong, but Brock was a writer and conservative working for the American Spectator magazine, who wrote mostly about the Clintons and all their questionable behavior in Arkansas once Clinton secured the rat nomination in 1992. This continued harassment hounded Clinton almost throughout his presidency. Then around 5 - 6 years ago, he writes a book "Blinded by the Right" saying that he was an ignorant, useful idiot for the vast right wing conspiracy, said he was gay coming out of the closet, and he's been a hard core lefty since then.
Remember the book about "The Real Anita Hill"? That was Brock. He has done a complete 180 to the dark side.