Why Sinema is wrong about political parties

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Arizona Sen. Kyrsten Sinema declared herself a Marxist on Friday. Not Karl but Groucho. As in, "I refuse to join any club that would have me as a member."

Sinema felt compelled to leave the Democrats, she explained, because of the "broken partisan system" and said that she had "joined the growing numbers of Arizonans who reject party politics."

Declaring herself an independent might not make a huge difference within the Senate if Sinema continues, as she said she will, voting the same way on the job. It's too soon to conclude how it will affect her re-election chances in 2024 if she runs, or whatever else she plans to do.

But one thing we know right now: She's wrong about political parties.

Begin with the Senate. Yes, being on a team sometimes means compromising. But Sinema should know that compromises are part of legislating. And parties make legislating a lot easier. Parties allow (more-or-less) stable coalitions to work together to get things done. Without them, a legislature could devolve into chaos as assorted factions block assorted proposals.

When Sinema was operating as a Democrat, Tillis could cut deals on the Republican side knowing that Sinema was able to negotiate in good faith for her party. That could still be the case if Sinema winds up acting as a de facto Democrat. But her ability to speak for Senate Democrats can no longer be assumed.

Party affiliation means that senators occasionally must cast tough votes that might not play well in their home districts in order to advance the party's priorities. But in return, senators know they are likely to get the support of the party's senators when they are pursuing the issues they truly care about. Without parties, lawmakers would have to cut deals with their colleagues one at a time, making it hard to accomplish anything.

That's not all. Parties are also very useful for voters. The party label is an informative shortcut that allows voters to rapidly assess not only what policies a politician is apt to support if elected, but also which groups and interests that politician will be especially attuned to.

Imagine voting without parties. One would have to carefully research each candidate's policy stances and group loyalties in order to cast an informed ballot. That would be difficult if there were elections for just one or two positions. It becomes nearly impossible when there are dozens of offices up for grabs in every election cycle.

That's why even when candidates aren't allowed to cite their party affiliation, as is the case in many municipal elections, candidates often find ways of signaling their partisan leanings. And voters like that.

Sinema is correct that many people claim to be independents. Few claim to like political parties.

But their behavior doesn't match those claims. About a third of individuals who say they are independent have voting records indistinguishable from people who call themselves Democrats; roughly another third are basically identical to self-identified Republicans. And the remaining third, the true independents, are mostly people less involved in politics.