Typo Or Freudian Slip?

This article by Jeffrey Rosen in The New Republic, on why it’s possible that Harriet Miers could turn out to be a good justice, has a picture of Justice Blackmun with the following caption:

Harry Blackmun’s attention to detail underminded his own jurisprudence.

Typo, or Freudian slip? We report; you decide, or not.

Say What?