I think the reason the Downing Street
memo didn't get much coverage in the US is that everyone basically knows
Bush started the war with Iraq on shaky pretenses, and has either already
decided to hate him for it or has already decided that they don't care.
Most of Congress is in that latter category, which means the current
American political climate won't welcome a smoking gun. At the same time,
journalists know that if they were the first to mention it then their
careers would be destroyed by the hate machine, against which being right
is effectively immaterial. We no longer have the kind of environment
where Watergate-style investigative reporting can happen...instead,
each fact is presented as an opinion -- either by itself or alongside
a contrary opinion -- and is then forgotten.
And given that lack of perspective, even those who're actually paying
attention are left asking "so what?"