No one really prevails if we have a nuclear war. The question is why would Russia commit national suicide over a tiny town in Estonia?
The American public is not used to taking losses and Congress is even worse.
I don't think you comprehend what is at stake here. The reason that NATO and our policy of deterrence and containment worked for 45 years and caused the collapse of the Soviet Union is that the Soviets believed we were credible on the use of force. Mutual Assured Destruction (MAD) has no winners and the losses will be devastating for everyone.
Because there's a better than a 50-50 chance that Obama will not fight.