In the wake of Proposition 8's passage, opponents are railing that churches that supported the ballot measure violated their tax-exempt status. It's a common accusation at the now-weekly protests, gaining enough traction that Geoff Kors, a member of the No on 8 executive committee, said lawyers are investigating the issue. "The Mormon church overstepped its boundaries by being a tax-exempt organization," said Sharone Negev, 54, of San Francisco, who has gone to protests in San Francisco and the Mormon temple in Oakland. "They clearly are not supposed to be involved in political activities." But interviews with experts and activists ...