Under overcast skies before 8 a.m. Saturday, volunteers queued up at the United Labor Center in Mission Valley to pick up Todd Gloria campaign literature and lawn signs. Also goody bags with snacks and a mask. A couple hours later, green campaign signs and crepe paper were attached to cars in a downtown parking lot for a six-mile, 26-minute caravan in and around Balboa Park. Backers gathered in a circle to hear Barbara Bry give them a megaphone sendoff. As San Diego mayoral candidates and volu...