Funny, there's nothing about that in the constitution.
Read the concept of representation as it was intended !
You are not to good at history obviously.
I suggest you start here
1 thru 85 of the federalist papers.
These are easy reading summaries and the complete texts are also available there.
http://www.teaparty911.com/info/federalist-papers-summaries/no_47.htm
And here is sound logic.
http://www.cato.org/publications/congressional-testimony/congressional-term-limits