The Republican way to keep cats out of your garden is to dig a 6 foot pit and suspend a can of open cat food on two crossed pieces of thin wood. The freeloading cats will try to creep out to the can and fall in. HA! No free lunch kitty!
Voila, Now you have a big hole instead of a garden and plenty of cats that can be filled in after a week or two.
Now send your cook or maid to Whole Foods to buy your produce.