It’s pretty amazing that CNN/USAT/Gallup and Zogby could conduct polls almost simultaneously in Wisconsin and come up with such diametrically opposed findings. Gallup (10/27-30) Bush +8 (52-44). Zogby (10/28-10/31) Kerry +7 (44-51). That’s a fifteen point difference, which is just massive. Similar, but smaller, disparities exist between Gallup and Zogby in other states too. I’m sure I knew the difference between their methodologies once. But I can’t remember now.