Traditionally, it has been Republicans that cite Supreme Court appointments as high on their list of reasons to vote, but the current political climate is very strange... so who knows? If RBG is replaced, I have no idea which party will benefit in terms of voter turnout, but I do know that the left will go ape shit. There will be riots and massive demonstrations, but if it happens before the end of summer, then I think they may just end up depressed and dejected by the time the election rolls around. But again, who the hell knows?