How to depolarise American politics

Edward B. Foley 

What you need to know:

Partisan polarization has become the greatest threat to political stability in the United States (and in other countries)

More than ever before, Americans are dissatisfied with their two main political parties, the Democrats and the Republicans. In a recent Gallup poll, 63 percent of respondents – the highest percentage ever – said ‘a major third party is needed.

Yet with voters so polarised, America’s conventional first-past-the-post electoral system (each voter casts a ballot for a single candidate, and the candidate with the most ballots wins) prevents a third-party candidate from posing a serious challenge, even if he or she can bridge ideological divides.

Democratic voters may greatly prefer a third-party candidate to the Republican, but they will still cast their ballot for the Democrat given their strong partisan preferences; Republican voters will act symmetrically, in the opposite direction. Only a sliver of independent swing voters will end up voting for the third party.

As in California, all candidates – regardless of political affiliation – would compete in a nonpartisan primary, with each voter casting a ballot for one of them. But, unlike in California, the top three (rather than the top two) vote-getters would advance to the general election.

Then, on Election Day in November, voters would express their preference between each pair of candidates on the ballot. Thus, a voter chooses between A and B, between A and C, and between B and C. The winner is the candidate who defeats both opponents: A would win if more voters choose A over B than B over A, and if more select A over C than C over A.

To see the advantages of such a system, consider Ohio’s 2022 US Senate race. The general election was a contest between the Republican J.D. Vance, who had been endorsed by former President Donald Trump, and Democrat Tim Ryan, which Vance won. The traditionally conservative incumbent, Rob Portman, declined even to run, because he saw that he would lose to the Trump-endorsed candidate in the Republican primary.

But suppose Ohio had used a top-three system. Portman would probably have chosen to run in the nonpartisan primary (where he wouldn’t need the Republican party’s nomination to be on the ballot), and the general election likely would have featured him, Vance, and Ryan.

On the part of the ballot pitting him against Vance (A versus B), Portman most likely would have won (say, by 54 percent to 46 percent), owing to the combined support of non-Trumpist Republicans, independents, and Democrats. And, against Ryan, he would have had all the advantages of a popular incumbent senator in a conservative state (winning by, say, 60 percent to 40 percent). Presumably, Vance would defeat Ryan by about 57 percent to 43 percent, as he did in the actual election; but only Portman would have defeated both opponents, because he was the candidate whom a majority of voters preferred over each of the alternatives.

This outcome underscores the inadequacy of the prevailing voting system, where Portman couldn’t even survive the Trump-dominated Republican primary. But it also reveals the shortcomings of California’s top-two method, where polarisation would probably have ensured that only Vance and Ryan advanced past the primary.

Of course, we have been assuming that some candidate (Portman, in the Ohio example) will emerge as the majority winner in both pairwise comparisons, because both theoretical and empirical work suggest that this is by far the most likely outcome. But it is conceivable that there would be no such candidate. Suppose against all odds Ryan manages a squeaker win against Portman, 51 percent to 49 percent. In that case, there would be a three-way tie with each candidate defeating one of his opponents, but nobody defeating both. We would need a tie-breaking rule to determine the winner. One attractive option is to elect the candidate who loses by the smallest margin. The victory would go to Portman, who loses by a margin of only 2 percent to Ryan.

Partisan polarization has become the greatest threat to political stability in the United States (and in other countries). There is growing despair about America’s capacity for self-government. But defeatist elegies are no help. We need creative, feasible institutional reforms that will solve the problem, and that can be implemented through ballot referenda (which many states, like Ohio, employ to bypass gridlocked legislatures).

The top-three system is a straightforward procedure that will appeal to most voters’ common sense. It will tend to favour moderates not so much because they are moderate, but because they command the greatest overall support. That is how to counteract polarization, revive the political centre, and restore hope for American democracy.

Copyright: Project Syndicate, 2024.

The writers are Edward B. Foley, and Eric S. Maskin, a Nobel laureate in economics, is University Professor at Harvard University.