Her recent calls for Secretary of Defense Donald Rumsfeld's resignation notwithstanding, conventional wisdom says Sen. Hillary Clinton is moving to the political center as she prepares to run for President in 2008. When, in June, she was booed by a roomful of liberal activists for repeating her support for the war in Iraq, some even suggested she had engineered a "Sister Souljah moment" to dramatize her newfound centrism. At first blush, such positioning would make sense. A rightward shift seems to be just what Hillary, who is broadly perceived as a liberal, needs in order to broaden her appeal. But...