SAN PABLO - On the fourth night of her front yard hunger strike, Diana Ponce lay delirious under the carport, fighting off the chill under a fuzzy blanket emblazoned with the Mexican flag. Neighbors sat clustered around her on white plastic lawn chairs. Children smacked at a yellow volleyball in the street. Toddlers tricycled past fence-strung banners that read "Tenemos Que Unirnos" -- We have to unite. Outraged by recent news accounts of vigilante Mexican border hawks, the 32-year-old San Pablo woman took to the streets -- really, her driveway -- on two lawn chairs pushed together. Ponce, a diabetic,...