Illegal Immigrants Are Bolstering Social Security With Billions

STOCKTON, Calif. - Since illegally crossing the Mexican border into the United States six years ago, Ángel Martínez has done backbreaking work, harvesting asparagus, pruning grapevines and picking the ripe fruit. More recently, he has also washed trucks, often working as much as 70 hours a week, earning $8.50 to $12.75 an hour.