The people coming from the Midwest carry their habits with them too, for sure, but the people coming from the Midwest are fleeing failure and trying to make their lives better, and make their votes matter. The more people we can get in Florida from Illinois, the better. Those people aren't the ones who want free shit for everyone.
This seems like kind of a narrow bridge to walk.
The sentiment is basically, we need to import people from a non-competitive state to a competitive state, but primarily people in the minority of that non-competitive state. But by the same token, California could lose some of its majority and create some changes in other places as well.
In the end, the idea of this migration pattern is kinda of just hoping for people to naturally gerrymander themselves in the favor of one party one might prefer. It's maybe an interesting thought exercise, but probably more fantasy than anything else.
It's also funny because at times people get very cross about the idea of others migrating to our state, but less issue when it comes to our own mobility. New Yorkers have been filling Florida for generations, but as the interloper, you feel sudden ownership of the place and hope they suddenly stop?
In any case, it does point to a quirk of the electoral college. It redistributes importance based on sort of broad social trends. In some places, votes feel like they count, in others they don't. Shoot, even states themselves are massively arbitrary. San Francisco is tied to Redding. Fairfield is tied to Chicago. Miami is tied to the panhandle. And of course a Californian can become Wisconsinite and a lifelong Illinois resident could be come a Floridian (or Texan or Arizonan or North Carolinian).