Earlier quoted context omitted.
Poor white people aren't likely to have an undocumented person living in their household though. People in that situation are much less likely to talk to government employees or to fill out census forms in the first place. So yes it's is undercounting poor people, but also disproportionately immigrants and relatives of immigrants.
Poor white people aren't likely to have an undocumented - person of color - living in their household. I've known a number of local households that had undocumented Canadians, Brits and Germans. It's been my experience that Americans who are hyper-concerned with illegal immigration, aren't grinding their teeth over these nationalities.
So I still stand by my point that poor white people aren't likely to have undocumented people living in their household at all. Regardless of race.
>I've known a number of local households that had undocumented Canadians, Brits and Germans.
Also how many of those households were poor? There isn't nearly as much incentive for a poor Canadian, Brit, or German to come here as an undocumented immigrant because they'd be giving up guaranteed health care and far more permissive social services.