Dean Johnson's statement is here.  At this point, the official boycotters are:  Yale, Harvard, Columbia, Stanford, Berkeley, Michigan, Georgetown, Duke, Northwestern, UCLA, UC Irvine, and UC Davis.   Chicago has declined to join the boycott, and Cornell's status is ambiguous.  No word yet from NYU, Virginia, Penn, Texas, Vanderbilt, Southern California et al.

Unless there is a snowballing of boycott announcements this week, I suspect that the net effect on USNews.com's mischief will be minimal.