There's no doubt about it, writes columnist Robert Novak: Former New York City Mayor Rudy Giuliani is running for the GOP presidential nomination in 2008. Novak made this declaration in his July 8 nationally syndicated column, reporting that friends of Giuliani confided he has told them of his intention to run for the White House. Giuliani - dubbed "America's Mayor" for his cool courage and spectacular leadership during his city's 9/11 emergency - leads at least one national poll, beating runner-up Senator John McCain, R-Ariz., by a healthy five points, Novak reports, citing last month's national Gallup poll that measured...