Separate from the Dems, but The Lincoln Project did run some ads aimed literally just at Trump to make him angry at his campaign staff. Here’s one example that ran on Fox News during the hours that Trump was most likely to watch it. The Trump campaign ended up sending a cease and desist over it
That’s assuming that all Trump supporters vote down ballot. I’ve been reading that a non-negligable percentage of Trump voters just voted for president and left down ballot races blank. Considering Trump only won the swing states by tiny percentages, a small percentage of Trump voters leaving blank the rest is easily enough to sway it
For instance, if we look at Wisconsin senate, we see that Tammy Baldwin has almost exactly the same number of votes as Harris (only a couple hundred more), but Eric Hovde shows less substantially votes than Trump got
Results with ~99% reported:
Donald Trump: 1,697,769
Kamala Harris: 1,668,082
(And about 40k for third party)
Vs senate
Tammy Baldwin: 1,668,545 [+436 from Harris]
Eric Hovde: 1,641,181 [-56,615 from Trump]