This kind of basic information should be part of primary education. It should be common knowledge as central as knowing one's multiplication tables or what the Bill of Rights is by the time a kid is graduated from the sixth grade or so.
It's not that hard. This article says it succinctly. Though the actual material in a school curriculum would be more extensive, of course, the the essence is the same.
If people understood this as they should, the current class-warfare pitch of Romney favoring the rich, not to mention the appalling distortion of his record at Bain, would be a much harder sale.