I do find it odd that there were so many Republican wins down ticket in some of the same areas where Biden won the majority of votes for President. There was no "blue wave" to accompany a Biden win yet there seems to be evidence of a "red wave" down ticket with an incumbent Presidential loss.
However, I'm not bringing the cases. I can only comment on cases that have been brought. I do know that the Republican down ticket wins are part of the legal argument for fraud in the Presidential race. It may not be evidence of fraud though, it may only appear improper though further fueling allegations of fraud.
If there are any cases being brought by Democrat candidates that lost their elections the media is certainly burying them for some reason.
I don't. President Trump is incredibly popular with his base and party loyalists but very unpopular with swing voters and waverers.
People like my late father in law hated President Trump but would have otherwise voted a straight GOP ticket.