We can’t change where people choose to live, but we can begin using some type of proportional representation system. For example, California could use a system like that in Peoria, Ill., for municipal elections. Instead of electing 40 state senators from 40 districts, voters in 10 districts could elect four senators each. Any candidate who won at least a quarter of the vote would earn a seat. These districts would be far more likely to be bipartisan, even electing some urban Republicans and rural Democrats.