Another thing to consider about some of these Midwest states: Trump has been talking about how there are Venezuelan gangs occupying all these towns in the Midwest, how they are given a green light to shoot police, blah blah blah. The people who best know that to be a ridiculous lie with no basis in reality are the people who live in WI, IA, etc.
The caravans were the way to do it. Literally nobody in the US lives where the caravans were. You can scare people with caravans. They might believe you. But when you say they are taking over WI and people in WI can see that's plainly bullshit, it sort of blunts the message.