"Proverbial Stanford" coincides a great deal with "Proverbial Harvard" - both are wealthy private schools that admit the very best students and have society's bias towards the well-to-do sons of well-to-do fathers. If you're looking for a school to contrast with Harvard, Stanford is a poor choice.
Furthermore, actual Stanford isn't doing any damage to actual Harvard. The data I've found suggest that 70+ or 80+% of undergrads admitted to both Harvard and Stanford pick Harvard.
Sources: http://college.mychances.net/college/tools/college-cross-adm...
http://mathacle.blogspot.com/2008/06/harvard-yale-princeton-...