Had to check online to be 100% sure the superPAC that mailed it was Trump-linked. I've never heard of Elissa Slotkin before, but apparently she's a US rep for another district in Michigan. Our rep is Rashida Tlaib, who is Palestinian descent, so I'm guessing the PAC's thought process in designing this was they don't want to link Harris to our actual representative so just pick some other random rep nearby.
As someone who does not want Trump to be re-elected, it's at least relieving to know how easy it will be for the democrats to counter these dirty tricks. All they need to do is have their candidate make clear public statements to clarify that she doesn't want this linked to her campaign. Of course, she'll have to clearly point out which specific parts are offensive, so people don't just think she fine with antisemitism. Explaining that being anti-apartheid is not the same as being antisemitic is pretty straightforward though, so this should be no big deal.
Democrats leave themselves open to this by being complicit in a genocide, using exactly that smarmy pro-apartheid PR speak, and suppressing student action and protest.
The "easy" way to counter this is to not be or support monsters in the first place.
But that would make Israel angry.