To be cutting edge in this presidential election, you have to learn the lessons of the '96 campaign. 1896, that is. ...At the headquarters of Texas Gov. George W. Bush, over cocktails with former GOP party chairman Haley Barbour, in the corridors of rightward think tanks, the party of Lincoln and Reagan has gone dizzy over William McKinley. ... The swami of McKinley Mania is Bush strategist Karl Rove, who got hooked two years ago during a class at the University of Texas. A tenacious student of political history, Rove dug deeply into the story of a canny, soothing heartland...