Not only does this editorial today explain succinctly what multiculturalism is, it also says what needs to be said, something the WSJ does often but not always. In the context of a movie review (The Stoning of Soraya M.), Andrew Klavan deals what should be an effective blow to the support of multiculturalism.
A resource it made me remember is Understanding the Times by David Noebel. Have your children read it before college. Read it yourself! This is, by the way, a good culture to emulate.