I don't know if folks have been back to visit this post, but since it was linked by the Carnival, Volokh, and The Corner, it seems to have accumulated a lot more evidence in defense of General Clark, offered by the commenters.

Example:

I must study politics and war that my sons may have liberty to study progressive taxation.

-John Adams

Or perhaps Clark was digging into his military history:

WE have not yet begun to tax the wealthy!

-John Paul Jones