I knew already some of the mentioned adjustments.
However, what I found interesting in the FTD is the comparison with the DM/Euro development, e.g. it seems that in Germany/Europe these statistics are much less manipulated than in the US - while it seems to me that people in the US tend to have a higher degree of trust to their gov than Germans. But of course the causality might be the opposite direction.

Der Amerikaner ist die Orchidee unter den Menschen
Volker Pispers