Gallup tested John Kerry, Hillary Clinton, Rudy Guiliani, and John McCain in potential 2008 matchups. Both McCain and Guiliani trump Hillary 50 to 45 percent in the hypothetical race. And both McCain and Guiliani come out on top over Kerry 54 to 41 percent.McCain comes out very strong with a 51 percent favorable rating to 22 perecent negative. However, Rudy Guiliani beats the field with a 64 percent favorable rating to 19 percent negative.There can be no doubt those numbers will fluctuate and settle closer to 50 percent range once the '08 camapign is in full swing.However, if you're Guiliani...