The marshmellows worked! The raccoons ate them and left my cat food alone! I have at least 3 cats come to the buffet - but all of them kept their back to the camera so I don't know who they are. I might need to move the camera to a different angle.
I have also been feeding them long enough that I will need to contact a feral group to see how to wean them off the food. At least the weather is getting warmer so they should be able to go back to hunting well.