Why are they not sending Walz out in public?
I have no idea. As a sitting governor, it should be an easy enough thing for Walz to do.
Not sending them out appears to be a strategy. Like when polls showed Hillary to be _more_ popular when avoiding the press. Maybe they count on that edge.
At some point, without covid as an excuse, I think it should backfire on them. But if they are confident in their 2020 operation repeating the feat, that may not matter. IMO