The comments on Krugman's NYT column have some great quotes:
"Democracy breeds its own enemy, which is extremism." —Prime Minister of Greece
"Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself." —John Adams
"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."—Abraham Lincoln
"The great enemy of the truth is very often not the lie, deliberate, contrived and dishonest, but the myth, persistent, persuasive and unrealistic."— John F. Kennedy
"Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule."—Frederick Nietzsche
"Democracy breeds its own enemy, which is extremism." —Prime Minister of Greece
"Remember, democracy never lasts long. It soon wastes, exhausts, and murders itself." —John Adams
"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."—Abraham Lincoln
"The great enemy of the truth is very often not the lie, deliberate, contrived and dishonest, but the myth, persistent, persuasive and unrealistic."— John F. Kennedy
"Insanity in individuals is something rare - but in groups, parties, nations and epochs, it is the rule."—Frederick Nietzsche