Former New York City Mayor Ed Koch has made it clear that he's not very fond of former New York City Mayor Rudy Giuliani, and now Koch wants Republicans to know something or two about their front-running presidential candidate. He's doing so by re-issuing his 1999 book, Nasty Man, along with some new comments about his successor. "I believe Rudy Giuliani would be bad for the country," Koch said. "So what am I supposed to do, be silent? I'm not!" Koch has endorsed Sen. Hillary Clinton for president in 2008.