What qualifies priests to preach about marriage?

Editor's Note:  This is an letter to the editor written by a member of Dignity/Columbus:

All the Catholic priests in Ohio called to a two-day convocation on marriage. Wow! According to two Dispatch articles of Nov. 6, "Help for modern marriages" and "Priests seek ideas to help newlyweds," this conference, part of a national effort to strengthen marriage, offered "speeches from clergy, theologians and academics with advice."