My husband sent me a link to an article in the New York Times. (With the paywall soon to go up, expect to see a lot of links to the Grey Lady, as it's really -- as a work colleague called it -- a "paysieve" and links get through.)
It considers the poor professional prospects for single evangelical ministers, and notes the built-in rationale for church planting. (A preacher's parallel to "publish or perish" -- parish or perish?)
This phenomenon is rather different among Unitarian Universalists, but with the Hot Stove Report out -- founded and reprinted by Unitarian Universalist ministers Hank Peirce (on Facebook) and Dan Harper (open web) respectively -- I expect to see, as usual, a disproportionally large number of white, straight, married fathers be called to the larger churches in more desirable cities. (With white, straight, married mothers filling in generally.) But without the data, it's hard to make that stick.
"Unmarried Pastor, Seeking a Job, Sees Bias" by Eric Eckholm. New York Times. (March 21, 2011)