I just found this terrific quote:

"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
26th President of the United States

Versus, say, Bush who calls debate on Iraq "irresponsible" and just yesterday said criticism of Iraq gives "comfort to our adversaries."

Another good quote:
"War is peace.
Freedom is slavery.
Ignorance is strength."
— George Orwell, 1984

I only mention.