This is from "One Hour News" which gives a figure of 167 clergy. Here is the list of the clergy.
More than 150 clergy from across Iowa have signed a letter of support for equal marriage rights for same-sex couples.
The letter was announced by Interfaith Alliance of Iowa Action Fund, a statewide organization that frequently advocates for civil rights. The group delivered the letter today to lawmakers during a press conference at the Capitol.
“The Supreme Court of Iowa recognized that equity and fairness is the starting point in our state’s constitution,” said Rev. Matt Mardis-LeCroy, Board Chairperson of Interfaith Alliance of Iowa and minister at Plymouth Congregational Church in Des Moines. “We as clergy from different faith traditions adhere to this principle and stand firmly with gay and lesbian couples to underscore the importance of marriage equality. Our traditions and practices as religious entities should never be used to exclude equal protection from anyone.”