From Cornell Laboratory of Ornithology:
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During fall and winter, the mockingbird diet consists primarily of wild fruit including holly, blackberry, pokeberry, sumac, poison ivy, Virginia creeper, and prickly pear. A propensity for devouring grapes and other cultivated fruit has at times earned it the enmity of growers. Throughout the year, but especially in the breeding season, insects and other arthropods are taken on the ground in areas of short grass, such as suburban lawns, or bare earth.
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If it becomes a problem, you could look into one of the organic sprays that doesn't harm the plants or wildlife (birds, beneficial insects, etc.) but will discourage the mockingbirds from feasting on your berries. I just listened to Bob Webster's gardening show on KTSA (550 AM in San Antonio) this morning and he was discussing something along these lines.
Bear in mind that the birds are doing their job, regardless of if they're going after the fruits or the insect -- by ingesting the fruits and seeds, the birds help disperse the plant's seeds elsewhere.