Republican presidential candidates Sam Brownback, Duncan Hunter, Mike Huckabee, John McCain, Ron Paul, Mitt Romney, Rudy Giuliani and Fred Thompson will attend the three-day Mackinac Republican Leadership Conference. The theme of the conference, which begins with a dinner program at 7:30 this evening, is "Relying on our Roots". The conference will be held at the Grand Hotel, Mackinac Island, MI.