Do Americans want their Congress to get on the bandwagon for a Soviet-American nuclear arms freeze? As a freeze resolution was introduced this week, two staunch partisans of national security gave the public some basis for choice. Secretary of State Haig warned a freeze would keep in place an imbalance of forces in favor of the Soviet Union. Former CIA director William Colby said that there are various imbalances in both directions but that each side has more than enough nuclear weapons to eliminate the other - a dangerous total that the proposed mutual, verifiable freeze would at least start to control. Nagging question: how would Russians vote if they could vote?