Quoting the quoter:

To announce that there must be no criticism of the President, or that we are to stand by the President, right or wrong, is not only unpatriotic and servile, but is morally treasonable to the American public. ~ Theodore Roosevelt (1918)

via Lisa English of Ruminate This! who also mentions a Rittenhouse post on the furrowed brow. Dang. Oh, well, I'll go read it.