Nearly 20,000 march in San Diego for immigrant rights ELLIOT SPAGAT Associated Press SAN DIEGO - Thousands of demonstrators marched through the streets of the nation's largest city on the Mexican border Sunday, demanding Congress abandon an effort to crack down on an estimated 11 million people living in the United States illegally. Nearly 20,000 people gathered at Balboa Park - home to the San Diego Zoo and a slew of museums - before heading to the heart of downtown and a county administration building, police said. No arrests were reported.