A San Jose Mercury News article names Professor Mariano-Florentino Cuellar as presidential candidate Barack Obama's prime adviser on immigration:

Young Stanford law prof is go-to guy on immigration.

Up-and-comer Cuéllar, 36, is the campaign's top immigration adviser. The Stanford law professor contends there must be a bipartisan approach to immigration reform. He also helps the campaign on international security, refugee policies, criminal justice and Latino outreach. No wonder he has been burning the late-night oil on debate preparations; "a crazy time," he describes.