This has nothing to do with Harris, but rather Democrats want to prove that Trump is lying about her.
Why has this become a thing? Well, I think at this point most people truly believe that Harris is probably lying about working at McDonalds. I doubt that it matters all that much to anyone whether she worked there, but it seems to matter to Democrats that Trump has gotten away with demanding she is lying. It doubly irritates them that most people believe him over her at this point. So like with everything else with liberals these days, this is an argument that they do not want to let go of and are willing to do whatever it takes to win it, including photoshopping.
Cum for Cum-Allah:
https://twitter.com/i/status/1850339389567820134
Obvious fake, knees show no sign of wear.
"Stolen from the memorial page of a cancer victim."