That subject line will not surprise anyone who has spent time on this blog over the years. The need for a multiparty system (and electoral institutions to support it) in the USA has been a consistent theme here since the very earliest green shoots of the virtual orchard.
Two recent essays by Seth Masket demonstrate the point very well, even if it was not the author’s intention (and I see no indication that it was).
What broke the Republican Party? Masket notes just how different the GOP of Romney and Trump are, and concludes that “Those in the new GOP no longer see the Reagan-Bush Republicans as members of the same party.”
The Party of Self-Doubt. Masket reviews the recriminations between progressive and moderate wings of the Democratic Party over an election win that felt more like a defeat in some ways, due to more limited success in non-presidential offices than expected.
These essays, taken together, are excellent demonstrations of the tension in trying to cram different tendencies into one of two large parties. In most democracies, these intra-party groups would be separate parties. And if they were, voters could actually choose among them in general elections, and thus shape the direction of whichever left or right (or other) camp wins leadership of the executive branch, and of the majority coalition in control of Congress, at a given election.
Perhaps even more importantly, voters who dislike the currently ascendant tendency on their side of the wider left–right divide would not have to cross over to the other side in order to punish the incumbent. This is not a new idea, of course. I will leave you with a quote from Henry Droop who noted this problem in his critique of two-party politics and the electoral systems that support it.
With majority voting they can only intervene at general elections, and even then cannot punish one party for excessive partisanship, without giving a lease of uncontrolled power to their rivals.
A longer excerpt and context is offered at this blog’s Droop page. Oh, and Droop observed this a century and a half ago.