If you go early (and you will be there early), Brown Sugar Kitchen in Oakland is a great spot. Weekend breakfast/lunch waits can be horrible, but that early shouldn't be bad. Also, Bette's Oceanview Diner in Berkeley is a good spot (same wait issues as BSK, and by the time you get up there, the waits might be already bad).
FWIW, and you might find this very appealing, very repulsive, or neither, Jelly Belly, using corporate dough, sponsored a Rick Santorum event at the facility in the not-too-distant past. Not that I ever spent much on their products, but now I won't be spending another dime, or even a fraction thereof.