The America First Committee was comprised of people who believed that we should only fight a war if America's vital interests were threatened. It was bipartisan, but essentially conservative in nature. One of the founders at Yale was Gerald Ford. The best known member was Charles Lindbergh. Other members were Col. Robert McCormick, another prominent conservative. The group disbanded itself after Pearl Harbor, and most of the younger members joined the military. A decent history can be found here:
http://www.etherzone.com/2001/raim080101.shtml
I agree that the America First Committee (which has not existed in 63 years) should not dominate the discussion. I posted this article because I also believe that the empire-building neo-cons who are willing to get us into any war they can should not dominate the discussion either.