Walz is new. I think they dropped Beshear because they are never going to win KY and even though he's a Southern governor and charismatic, he's younger than Kamala and not particularly well known nationally (yet).
Heavy on governors (expected) and no Mayor Pete (though he's already vetted, so...)
I'm a fan of Tim Walz but I don't know if MN can afford to lose him.
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My MN friends are NOT amused at the idea of losing him.