It's much more complex these days as compared to the days of yore. Neither side will do as you suggest, the Republicans/conservative talk a good line but in reality wouldn't change a thing. It would change their grip on power with in society.
The Democrats/Liberals won't do it for all the same reasons.
It's a flip side to the same coin.
To be honest, there is no such thing as a true Conservative (ideal wise) or a true Liberal (Ideal wise) in Washington anymore.... It's all about power, money and their own pet agendas.