I said that no party held the privilege of dictating to me how I should vote. That if party loyalty was a form of patriotism, I was no patriot, and that I didn’t think I was much of a patriot anyway, for oftener than otherwise what the general body of Americans regarded as the patriotic course was not in accordance with my views; that if there was any valuable difference between being an American and a monarchist it lay in the theory that the American could decide for himself what is patriotic and what isn’t; whereas the king could dictate the monarchist’s patriotism for him—a decision which was final and must be accepted by the victim; that in my belief I was the only person in the sixty millions—with Congress and the Administration back of the sixty million—who was privileged to construct my patriotism for me.

They said “Suppose the country is entering upon a war—where do you stand then? Do you arrogate to yourself the privilege of going your own way in the matter, in the face of the nation?”

“Yes,” I said, “that is my position. If I thought it an unrighteous war I would say so. If I were invited to shoulder a musket in that cause and march under that flag, I would decline. I would not voluntarily march under this country’s flag, nor any other, when it was my private judgment that the country was in the wrong. If the country obliged me to shoulder the musket I could not help myself, but I would never volunteer. To volunteer would be the act of a traitor to myself, and consequently traitor to my country. If I refused to volunteer, I should be called a traitor, I am well aware of that—but that would not make me a traitor. The unanimous vote of the sixty millions could not make me a traitor. I should still be a patriot, and, in my opinion, the only one in the whole country.

~Mark Twain (as quoted in "Democracy 101:Mark Twain's farewell address" by Lewis H. Lapham: Harper's, April 2011.)