Team Joe's going with the airdrop insertion/extraction campaign strategy.
They can't even cart Joe around by ground transportation anymore, because the tricksy Trumpsters will follow him around and make sport of him.
He has to land at tiny little locked-down airports, blither nonsensical blatherings at a handful of vetted lickspittles, and then take off again, and make fast his escape.
They may as well have him in a plastic bubble in order to protect him from the mean Trumpsters, and their hurtful taunting and ridicule.
Seriously, what's the point of this? Just so they can say he's "campaigning in Wisconsin" when he's basically locked up in a diving bell, and they're just sorta dipping him down into the water for bit, and then hoisting him back out again?
It's just embarrassing.