They already play games with who appears first in the lists. Here in Florida, I watched them manage to bury the Democrat candidates among the Republican and independent and write-ins in a clear attempt to be confusing on the ballot.
I’m not saying Florida’s very nice for doing that, but so long as the choice is there, same font size, etc, if they do something ridiculous like moving the democrat into the NEXT COLUMN and say “oops how did that happen?” causing people to accidentally vote Republican thinking there’s no Democrat, well, they do that stuff anyway and there’s no stopping that – no Supreme Court case on that.