While I know this is probably more joking than serious, I just want to add my two cents.
I think this is a marvelous idea. Too many people, in America especially, misconstrue the constitution or haven't even read it. I think that adding this in may not add much value, but I think it would be a worthwhile addition. So if the coin ever takes off it's not only a fun little thing to dabble in but an educational tool.
Maybe even a region selection box and then the constitution of the respective country.