Us and the heart of civilization

Blogging about the convention, William Saletan hits on a profound point. It's not just Democrats, however, the framing of "us" and "them" is perennial and it's the expansion of "us" that is at the heart of our civilization.

Obama, like other speakers at this convention, complains about "companies shipping jobs overseas" and workers "losing their union jobs at the Maytag plant that's moving to Mexico." At the same time, Obama holds himself out as a symbol of a diverse, welcoming America. How can Democrats be the party of diversity at home but xenophobia abroad, the party that loves Mexican-Americans but hates Maytag plants in Mexico, the party that thinks Obama's mom deserves a job more than Obama's dad does? I understand the politics of it. But what about the morals?