With the death of Judge Ruth Bader Ginsburg, the presidential election talking points take a hard shift.
If the president announces his choice to replace her, it will motivate Democrats to come out to vote. It won't change many votes, but it will generate enough outrage to persuade some undecided (or lazy) voters to return their ballots.
On the other hand, this appointment is a large source of support for Donald Trump, and that's the problem. Some Trump supporters might decide that this appointment fulfills their wishes, and they are no longer motivated to hold their collective unmasked noses and vote for Trump.
It also removes Senators Lee, Cotton, and Cruz from the list -- McConnell will need their votes in the Senate to wedge this turd through the door. They were never serious names anyway, just there to get out the vote, though that could change if the Republicans retain power in January.
The odds that McConnell won't get away with this are dismal. The only hope for 2021 is that a conservative slot opens up for Biden to appoint someone (unlikely) or that the new Congress adds two additional justices -- this is also unlikely, only because it seems too bold for someone like Biden. But it will come up.
Last night's news also means that all Trump-related Supreme Court battles will either be quickly resolved or entirely dismissed, unless John Roberts has more integrity than suspected. But he just might.