You forget that the source is the one that is important.So basically the SS comments to a liberal mind are "biased crap".
and a conservative mind, "truthful reports".
Think about the type of people Secret Service personnel generally are though. Replace them with hippie journalists and the comments/observations would probably end up favoring the behavior of Carter, Clinton, Obama, etc. and trashing Ford, Reagan and the Bush's as being too "square" and/or "abusive" somehow. Seems at least partially a matter of the eye of the beholder and their given perspective. Definitely not impartial, but that's pretty typical of human behavior.
If's it's pro-left; then the left says that it's gospel and the right says that it's BS. If it's pro-right, then the reverse is true.
Sadly, nothing is ever completely left or right.
I was hoping for more pro / cons for each president. Obama isn't a saint, Reagan isn't either and Nixon / Rove isn't that bad.