Joe Biden dies a "natural death" before the midterms. Kamala calls for a period of national mourning, democrats campaign of poor fallen Joe, democrats hold on to their seats (partially through dominion software, partially from a "bump" due to a fallen president), and things continue as they are.

You can see this coming a mile away. Joe's handlers are literally running him into the ground so they can hang everything on him before midterms. With him gone, people will be moved by the emotion but also a big sigh of "well that's over"