Just get yourself some state or US cookie cutters and go to town!
Or take an image to your local bakery and have them put some edible prints on some cupcakes!
Or get some white and blue cupcakes and put some glasses on them.
Or have fun with some free-hand designs.
Bake up some traditional snacks and get creative with re-naming.
If you've made your own Bernie themed food, take a photo and tag it with #SandersSnacks and #DIYforBernie.
All images come from Bernie's official Tumblr.
UPDATE 09/19/15: here's a new post that gets into debate food beyond deserts.