We need a constitutional amendment that returns their election to the hands of the state legislatures and forces them to represent their states.
The fly in that ointment is that first we'd have to fix the state legislatures. Even here in Texas, where the legislature is probably better than most, we still have a Communist pest-hole called Austin* that exerts an unwarranted and disproportionate influence over state government. And of course if you live in a state like Illinois, you are really living in Chicagoland.
*I've often thought had sad it is that there are some cities in Northern California with signs of intelligent life. If we could just swap one for Austin - what a great deal for both cities. Hell, California would never notice three quarter of a million or so more liberal loonies - and we'd never miss ‘em.