It's interesting that her choice is a bit of a mirror of the Vance pick, in terms of what the campaign was trying to accomplish. I mean, they're very different people, obviously - but they seem to serve the same roles in terms of what the campaign was aiming to add.

Both campaigns went for a midwesterner from a non-swing state that they feel will be a good performer on the stump and in articulating the campaign's messages. Both campaigns went for the choice that most strongly signals that they prioritize holding their base tightly to them, rather than a gesture to other parts of their coalition.

Walz will probably end up being the better choice than Vance (though who knows!), given that he's just been in federal politics a lot longer. While some people regard that as a negative, it also means that he's less likely to have made any really impolitic comments over the last twenty years or so, since he's just had the sort of job where people tend to be careful about what they say on social media and in interviews....