When Does A Democracy Fight?

We are currently trying to decide whether we will continue to fight in the battlefield of Iraq. There is a famous quote that talks about when to fight that seems terribly appropriate for America to listen to right now:

"Still, if you will not fight for the right when you can easily win without bloodshed; if you will not fight when your victory will be sure and not too costly; you may come to the moment when you will have to fight with all the odds against you and only a precarious chance of survival. There may even be a worse case; you may have to fight when there is no hope of victory, because it is better to perish than to live as slaves."

~~ Winston Churchill