Lupe Moreno knows the immigrant struggle. She has lived all her life in Santa Ana, a gateway community for Mexican immigrants. Her father helped smuggle them into the country; her former husband sneaked in illegally. Now Moreno is part of the growing movement to stem the flow of illegal immigration. "I want people to know that there are Latinos who are law-abiding," she said. "We need to protect our borders." Although polls suggest that the majority of Latinos are sympathetic to illegal immigrants once they have settled in the United States, opinions vary by generation, home country, economic class and...