Governor O'Malley's office reportedly released his private correspondence with Archbishop Edwin O'Brien of Baltimore at the media's request:
Two days before Maryland Gov. Martin O’Malley (D) announced plans to sponsor a same-sex marriage bill, a Catholic archbishop strongly urged that he reconsider the move, suggesting the governor was acting out of “mere political expediency.”
Edwin F. O’Brien, the archbishop of Baltimore, said in a letter late last month that sponsoring the bill would “deeply conflict” with O’Malley’s Catholic faith and that he should resist pressure to do so after New York’s recent legalization of same-sex marriage.
... O’Brien’s letter also signals that the Catholic Church is gearing up for another fight on the issue in a state where the governor and both presiding officers of the legislature are Catholics.
O’Malley, who often attends weekday Masses and has sent his four children to Catholic schools, until recently advocated civil unions as an alternative to same-sex marriages. --Washington Post