a lot of people want to crack down on illegal immigrants in arizona and other border states believe they're taking jobs away from american workers but is that really true? gary tuchman decided to see how firsthand in a sweltering heat of a california vineyard. >> reporter: before dawn, migrant laborers in the california desert. despite triple digit temperatures still to come, they wear long sleeves, scarves and bandannas to protect themselves from the sun and the dust. their job today, to pick the purple grapes you'll snack on tomorrow. they're all veterans and they're all mexican, except for me. the rookie american, who is joining them for a full day of work, the only person in short sleeves. the only person who doesn't know what he's doing, but i've been assigned a partner. benjamin rodriguez has worked in the california fields for 32