So neither you nor I would sink this low. Okay, but some people would, we have seen claimed in the news. I haven't heard people SAYING they reregistered from Dem to GOP in Maryland to vote for Dan Cox (Hooray, Dan Cox for Governor!! Down with RINO Hogan!!!) so I don't know if there's a word of truth in this claim that Dems actually put Trump-supported Dan Cox over the top in Maryland, in the Republican primary.
Actually, I don't believe it. It's a lot of trouble to reregister party and I doubt many did it. I reregistered twice from GOP to Independent (during all the lousy GOP prez candidates during Obama) and then back again, so I know. I think Dan Cox won because Republicans are sick of that awful, short, bald, virtue-signalling excuse for a RINO Hogan, and we all voted for Dan Cox instead of the stupid Hogan proxy.
If you mean Dem money-men are giving big campaign contributions to Trump candidates, probably true. But these are Dem pols, and we already know they are immoral. This is not a big surprise.
I think it's okay, in the sense that they are likely to get hoist on their own petard. Real people vote for the Trump candidates and Dems give them money, and they win, and they may very well take over. Hey, money is good. I'd rather Dem money go to my guys than to those awful Dem commies.