The JTA reports: "A Rabbinical Council of America official told JTA that Rabbi Haskel Lookstein, the religious leader of Congregation Kehilath Jeshurun in New York City, broke the organization's rules by participating in the service Wednesday at the National Cathedral on the morning after Barack Obama's inauguration."
This is a huge mistake by the OU to have even released the press release. I understand that they, mistakenly, believe that it is inappropriate for a Jew to enter a space used by another religion (church, mosque, temple, etc), but it is a big political mistake to make a big deal of it on the day of Barack Obama's inauguration. The OU should have simply looked the other way and let it go.