Also, the worst thing for Republicans is for the primary to be over and everyone united behind Joe Biden. They want the primary battle to drag on as long as humanly possible, and there is a reason why Trump (and Russia and many other parties) have invested so much energy in trying to get Bernie to be the nominee... or at least stay in to the bitter end with no one having a majority of the delegates.
Biden has been polling +30 in Wisconsin, and there is probably a 0% chance he wins by that much today. More likely than not he will win by a thin margin or lose, because Bernie does *much* better among young people and those that vote remotely. That's why Republicans, not Democrats, challenged this one and fought it all the way to their Supreme Court where they got their Republicans to say "go violate the public health order, who care if people die."
It's also the same reason the Democrat establishment, not Republicans, were the loudest voices against DeWine... and why Bernie supporters were pushing for every primary to be cancelled like Ohio... because Bernie was about to get obliterated in Ohio and further lock up the nom for Biden. Each guide is guilty of transparently acting in their best interest, when really EVERYONE should clearly be in favor of no in person voting right now if we're canceling basically all other public gatherings. It's about being consistent and putting people first.