What really put it over the top for me with Rather was when he said he considered Clinton an honest man.
Not to be a bomb-thrower, but outside the U.S., the Bush family connection to the bin Ladin family is well-known. There's nothing sinister or surprising in that, really (if you're in the middle-eastern oil business, it would be weird not to do business with the bin Ladins). There is a lot of speculation about the connection in non-U.S. news sources, and a good newsman like Walter Cronkite would be aware of these speculations.