superficially this argument seems reasonable.. but my limited understanding of the history of the Supreme Court of the United States says that there have been substantially different eras, and substantially different rules in those eras, for this same Federal body. Needless to say, in a "two party" political system, the details of what each of those two parties represents has also changed dramatically.. i.e. what is called conservative has changed quite a lot, many times.. same with "liberal"