safe, not because of walls but in spite of walls. [ speaking spanish ] he s a year and a half old. for beto, who grew up bilingual among families from both sides of the border, these issues are deeply personal. he absolutely believes that a country of immigrants is a better country and that the immigrant experience in this country is fundamental to the story of america. a quarter of those who live here were born in another country. their very presence makes us safer, more successful, stronger, more secure. that s his issue. it s a home game for him. not an away game. as it is for other candidates coming onto that field. coming up later he s a relentless campaigner. the number they throw out is he knocked on 16 thoub doors. knocked on 16 thoub doors. [quartet singing] bum bum bum bum. pass the ball. pass the rock..