WASHINGTON - President Bush (news - web sites) and his vice president conceded Thursday in the clearest terms yet that Saddam Hussein (news - web sites) had no weapons of mass destruction, even as they tried to shift the Iraq (news - web sites) war debate to a new issue — whether the invasion was justified because Saddam was abusing a U.N. oil-for-food program. Ridiculing the Bush administration's evolving rationale for war, Democratic presidential candidate John Kerry (news - web sites) shot back: "You don't make up or find reasons to go to war after the fact." Vice President Dick...