US constitution

[IceAgeComing]

You don't actually need that many changes: I'd elect the House through a form of Proportional Representation plus give the Territories some representation at least (certainly in the House; maybe limited Senate representation as well: makes sense for it not to be equal since there are advantages to being a Territory and if you made it equal then you either have to get rid of those or the other states would moan about it) and probably keep the Senate the way - maybe move to four year terms for the House and eight year Senate terms (each state with one up every four years) in order to prevent the eternal electioneering that plagues America.  Oh; and actually empower Congress to limit campaign spending.