KENNEBUNKPORT, Maine (Reuters) - President Bush (news - web sites) questioned the authenticity of documents aired by CBS News that said he received special treatment during his Vietnam-era service in the National Guard, according to a Bush interview published on Saturday. "There are a lot of questions about the documents and they need to be answered," Bush told the Union Leader newspaper of Manchester, New Hampshire, after a week in which some experts questioned whether the documents had been fabricated by those seeking to damage Bush in his re-election race. "I think what needs to happen is people need to...