SPRING GREEN, United States (AFP) - Democratic presidential challenger John Kerry (news - web sites) appealed for an end to the TV advertising war that has marked his election battle against President George W. Bush (news - web sites). Kerry said the avalanche of negative television spots and attacks being shown on US screens was scaring off voters. ***More like kicking his Butt. "Americans need a real conversation over our future," Kerry said in a speech at a school in Spring Green, Wisconsin. "What they don't need is all these trumped up advertisements, they just make people curl up and...