As you can see, from Election Day through the end of June, the situation completely reversed itself: The COVID-19 death rates in the reddest counties began to run higher than in the bluest counties...as much as 2.66x as high, in fact.
First, you have to remember that not every American who has died of COVID since last November is a voter. A small percentage are either under 18 or aren't U.S. citizens. Even among those who are, total voter turnout among eligible voters last November was only around 66%...historically high, but that still removes a good 1/3 from the equation right off the bat.
That leaves perhaps 229,000 potential U.S. voters who died between 11/04/20 - 6/30/21.
The biggest unknown by far is what proportion of them were likely to vote Democratic or Republican in 2022. In the table below, I've made a spitball guesstimate about the proportions within each bracket:
If my assumptions above are close to accurate (which is admittedly a big "if"), it would mean something like 87,000 Democratic voters and 124,000 Republican voters died during that time period, plus another 18,000 or so independents or swing voters, for a net loss of ~37,000 more Republican voters than Democratic nationally.
Here's the bar graph with data starting on July 1st, through yesterday (September 7th). The Y-Axis scale is obviously much smaller since the total deaths are much lower, but the trendline is far more stark: Since the beginning of July, the death rate in the reddest counties has been as much as 7.6x higher than in the bluest counties:
Again, assuming this is reasonably close, it would mean something close to 13,800 more Republican voters have died over the past 2 months or so than Democrats nationally.
As for Nebraska and Florida: Again, I'm reluctant to include this in the table above, but if you put a gun to my head I'd say the "net GOP voter deaths" since 6/30 would be around 4,000 higher if both of these states were included; call it perhaps ~18K more GOP than Dem voters having died of COVID since the end of June.
If so, that'd be a total of perhaps 55,000 more so far this cycle (~146K GOP, ~91K Dem, ~20K Swing/Indy).
What about going forward between now and November 2022?
That's mostly an unknown, of course...but the biggest unknown is the total number of additional COVID deaths the nation is facing between now and then.
Let's assume it ends up being something like 150,000 more Americans dying of COVID between now and then, at roughly the same ratios as in the June - September data above (that is, roughly 80% GOP & 15% Dem). That would boil down to something like 74,000 additional Republican voters and 14,000 additional Democratic voters, for a net loss of 60,000 more GOP than Dem voters nationally.
The grand total would then stand at somewhere around ~105,000 Democratic voters, ~220,000 Republican voters and ~26,000 swing voters having died nationally between 11/04/20 - 11/08/22...or a net loss of perhaps 115,000 more Republicans than Democrats overall.