He also had a powerful ally in his corner: former New Hampshire governor and Bush White House chief of staff John Sununu.

Souter sailed through the process, and was confirmed by the Senate 90-9. (Senator Pete Wilson of California did not vote, and Senators Ted Kennedy and John Kerry of Massachusetts voted against Souter—how do you like dem apples?)

Souter was never supposed to be a hard-right ideologue. That distinction would go to Bush’s next appointment, Clarence Thomas, who was considered for nomination after Brennan retired, but Bush wanted to “save” him for when Thurgood Marshall retired (because… they’re both Black, you see). Souter was always supposed to be a moderate conservative.

And he was. Souter did not become more liberal as he served on the Supreme Court—the Republicans on the Supreme Court became more extremist while he served, and Souter simply refused to descend into that kind of darkness.

Souter liked facts, and facts are anathema to movement conservatives. I think Oyez sums up his judicial philosophy quite nicely when they write: “Many of Souter’s opinions expressed a view that law should depend on underlying empirical facts and should change when those empirical realities shift.” Souter defended democracy, which meant that he defended the rights of the elected branches of the government (Congress and the president) to do pretty much whatever they wanted with minimal judicial intrusion. He was conservative, back when that meant something other than white-wing culture-war issues masquerading as law.

The difference between Souter’s practical conservatism and the right wing’s extremism came to a head in the 1992 case, Planned Parenthood v. Casey. That was the frontal challenge to Roe v. Wade that conservatives, with an 8–1 advantage on the Supreme Court, thought they could use to kill abortion rights. But they were mistaken. Souter and other Republican justices like Sandra Day O’Connor and Anthony Kennedy joined forces to write the majority opinion in that case that saved Roe. I’ve written about that case in detail and explained that it was the moment, the last moment, when practicality won out over ideology among some Republican justices.

Republicans never got over Souter or his vote in Planned Parenthood. By the time George W. Bush was appointed to the presidency by the Supreme Court (with the help of Souter, by the way, who joined the Republicans in Bush v. Gore, which ruled the Florida recount unconstitutional, while dissenting from the Republican majority’s opinion that no constitutional recount could be fashioned), there was an ongoing refrain within conservative circles: “No More Souters.”

I’d argue that Republicans reformed their entire judicial nominating process to avoid making another pick like Souter. Souter was the reason the Federalist Society got control of the Republican judge-making process. He would be the very last nonideological pick made by a Republican president. Don’t believe me? Here is the list of Supreme Court justices successfully appointed by Republicans after Souter: Clarence Thomas, John Roberts, Samuel Alito, Neil Gorsuch, Brett Kavanaugh, Amy Coney Barrett.

All six of those justices voted to overturn Roe v. Wade in Dobbs v. Jackson Women’s Health Organization.

While Souter made Republicans rethink how they went about nominations, he lulled the Democrats into a false sense of security and complacency about their own nomination process—and the fight for the courts. Souter (and O’Connor to a large extent) made Democrats think that Republican-appointed justices could be reasoned with and would rule on the side of law and practical realities instead of partisan politics. Democrats never really got the memo that Republicans had changed their entire strategy around the Supreme Court. The same Democratically controlled Senate that confirmed Souter also confirmed Clarence Thomas a year later. Somehow, Democrats couldn’t spot the difference.

Souter retired in 2009, at the age of 69. He was still a healthy man and could easily have served another decade. But he never took to Washington. He moved back to New Hampshire and went back to hearing cases on the First Circuit, the job he was never really allowed to have. His retirement gave Barack Obama his first Supreme Court vacancy, which he filled with Justice Sonia Sotomayor. Sotomayor presented as a moderate, centrist liberal—in the mold of Souter, actually. She’s probably slid to the left on the court far more than Souter ever did, but, ironically perhaps, she’s gotten there in the same way that Souter did: through being hyper-concerned about the underlying facts of the cases she hears.

A jurist like David Souter could never be appointed to the Supreme Court these days, by either party. The era when a president can pick a justice without knowing beforehand where they’ll fall on all of the most important issues and cases is over. Justices now need to prove they’ll align with the agenda of the president who appointed them, more or less. Each party has “litmus tests” and failure is not an option.

Most people will say that’s a bad thing, but I have no time for such wistful naïveté. The Supreme Court is the most powerful branch of government, the only one that can functionally veto the other two combined. As long as the court has the power to act like a partisan branch of government, it must be filled with partisans.

Souter is the appointment you make when you think the Supreme Court is above politics. But Souter lived long enough to see that the court simply doesn’t work that way anymore.