Past experience shows that proportional representation is possible in the US. But there are tradeoffs.

The way that state and federal government are elected in the US has changed very little in the past two centuries. Yet, the entrenched two-party system has led to increasing calls for electoral reform. One reform, used in many other countries, is proportional representation. Jack Santucci writes that some US cities were actually able to institute proportional representation before 1950 when the losing party and ruling party defectors teamed up. He cautions, however, that proportional representation does have its trade-offs.