WASHINGTON (Reuters) - President Bush prepared to take the oath of office for a second term on Thursday and will tell Americans "the survival of liberty in our land" increasingly depends on advancing freedom abroad, in an allusion to his hotly contested Iraq policy. Three hours before his swearing-in ceremony on Capitol Hill, Bush, who has considerably less popular support than other recent incumbents after their re-election, attended a morning church service with his family at St. John's Episcopal Church, attended by presidents since it was organized in 1815. At noon (1700 GMT), Bush will stand on the steps of...