Ten days ago, a friend suggested that Tim Walz would be Kamala Harris’s best choice for her VP. My response was: “Tim who?” I looked him up on Google, and I was intrigued. He is Governor of Minnesota. He grew up in Nebraska. He taught public school for 20 years. He believes in community schools. He believes in public schools.

Then I saw Jen Psaki interview him on MSNBC, and I became a believer. Without being asked about education, he volunteered that vouchers were a terrible idea, and he was well informed about why. He had read the research.

I was pleased to see that Ryan Cooper of The American Prospect agrees with me.

He wrote:

With Kamala Harris abruptly taking Joe Biden’s place as the next Democratic nominee for president, speculation about who will be her running mate has naturally exploded. Some reporting has the choice being narrowed down to Pennsylvania Gov. Josh Shapiro, Sen. Mark Kelly of Arizona, Gov. Roy Cooper of North Carolina, and perhaps Secretary of Transportation Pete Buttigieg.

I am neither capable of nor interested in trying to predict which one she will pick. However, I do believe there is a better choice that fits all the apparent criteria: Minnesota Gov. Tim Walz.

First, the other contenders have some significant downsides. As David Klion writes at The New Republic, Shapiro is one of the worst Democrats in the country on the Gaza war. He supports legal prohibitions on the BDS movement, joined in the cynical Republican dogpile on University of Pennsylvania President Liz Magill, repeatedly implied that all the protesters against Israel’s war are antisemites, and in general supported Benjamin Netanyahu’s psychotic violence for the last nine months. To be fair, Shapiro had also said that Netanyahu is “one of the worst leaders of all time” who is leading Israel in the “wrong direction.”

Biden’s support for Israel’s war has badly split the Democratic Party, and alienated key youth and minority constituencies. It is vital for Harris to at least paper over this crack (and, one hopes, actually force an end to the war should she become president). She seems to realize this, and sources close to her are leaking stories to reporters about how she would likely take a different tack on Gaza.

Picking Shapiro would immediately reopen that wound in the party coalition. Many activists would immediately start attacking her vociferously, deflating the rare moment of party goodwill and optimism that has built up.

Sen. Kelly is not so incendiary as Shapiro, but he has one massive black mark on his record: Back in 2021, he refused to support the PRO Act, a sweeping overhaul of labor law that would make it easier to organize and add some actual punishments for companies that break the law. One of the reasons so many employers routinely infringe on their workers’ rights is that when they do, the typical punishments are tiny fines or being forced to put up a sign. Even Sen. Joe Manchin (I-WV) supported the PRO Act. Picking Kelly would also mean Dems have to win a special election in 2026 to keep his Senate seat, while he would otherwise not be up until 2028.

Unions are not only a core Democratic Party constituency and source of campaign cash and precinct walkers, as Hamilton Nolan argues in his recent book The Hammer, they are absolutely vital for rebuilding a source of institutional ballast in the party that isn’t a handful of ultra-rich donors, and, indeed, for protecting American democracy over the long term. Kelly reversed course and endorsed the PRO Act on Wednesday, but this belated conversion makes his sincerity somewhat questionable.

Buttigieg is great on TV, but he has also never held even statewide office, and his tenure at the Department of Transportation has been marred by severe problems in both the airline industry and at Boeing. That’s not really his fault, but also probably not something Americans want to be reminded of.

Of the named contenders, Roy Cooper is perhaps best on paper. He’s a white guy from a swing state, he’s term-limited out, he’s been elected repeatedly in this otherwise Republican state that some think could swing Democratic this year with him on the ticket, and best of all, he’s got an excellent surname. However, he’s also a bit old at 67, and doesn’t have a very inspiring record—mainly he has been trampled underfoot by feral Republicans in the state legislature, who have all but abolished democracy at the legislative level with extreme gerrymandering. That’s not his fault, but it also doesn’t give him much of a record to boast of.

So let’s consider Walz. Demographically, he’s just what the party apparently thinks it needs: a straight, white, cis man from the Midwest. He’ll also be term-limited out in 2026. Though he doesn’t exactly look it, he’s also on the younger side—almost exactly the same age as Harris, as it happens. He’s also quite a good attack dog on TV.

More importantly, he’s had the best record of any recent Democratic governor. (Some might argue for Michigan Gov. Gretchen Whitmer, but she’s taken herself out of the veepstakes.) By way of comparison, New York Gov. Kathy Hochul, blessed with an overwhelmingly Democratic legislature, recently canceled a congestion pricing scheme that had been in the works for decades, flushing perhaps a billion dollars down the toilet in the process. Meanwhile, Walz, with just a one-vote majority in the state Senate, has signed a legitimately sweeping set of reforms. As I detailed in a Prospect piece some time ago, these include a major expansion of labor rights (including a first-in-the-nation ban on employers compelling employees to attend anti-union meetings), a new paid family and medical leave system, protections for abortion and LGBT rights, legal recreational marijuana, restored voting rights to felons, universal free school breakfast and lunch, and more.

That reform package isn’t some kind of radical craziness far out of the Democratic mainstream. It amounts, more or less, to a state-level version of Biden’s Build Back Better agenda. Picking Walz would signal that Harris is serious about her plans to take another big policy swing, should Democrats win control of Congress, and likely inspire rank-and-file Dems to work even harder on her behalf.

The choice of running mate is often discussed in terms of campaign strategy—how the candidate might pander to certain regions or demographics, how the media might react, and so on. But as we are seeing right now, there is also the possibility it will be a very consequential decision. Just as Harris is taking Biden’s place in the campaign, her vice president might have to take over in turn. Tim Walz has shown he has what it takes.