While that’s true, even Trump will throw a few hollow words in support of other Republicans and declare himself a Republican and knows the result is his life is easier with Republicans victories.

In a hypothetical cheating scenario, it’s not like Trump directly did the cheating, some broad conspiracy across multiple states would require a number of players, coordinated since the “evidence” is similar dropoff across many states. Any such conspiracy would doubtless recognize the strategic value of allies also winning, even if they didn’t care about the allies directly. Such a conspiracy would be keyed into the same sentiment that wants to do everything they can to install conservative loyalists across the executive and judicial branches as quickly as they can. There’s no way such a conspiracy would neglect legislators and state governments if they had given themselves that opportunity.

The drop offs could be explained much more simply that MAGA is only about Trump and not about Republicans. If Trump only cares about Trump, the same can be said if his followers. Most of them will vote R as long as they are filling out a ballot anyway, but they barely even show up for Trump loyalists in the midterms. So it’s quite reasonable to expect a bunch of Trump people to just go in for the one thing they care about and ignore the rest.