The bounty-hunting Chapman family may, at first glance, seem unlikely advocates for gay marriage, but on "Dog The Bounty Hunter" (Wed., 10 p.m. EST on A&E) they threw their weight behind the NOH8 Campaign.   To help get across the NOH8 misson of promoting marriage, gender and human equality, the Chapmans participated in a photo shoot for the organization. They wrote "NOH8" on their faces and then duct-taped their mouths shut.   Duane Lee said watching his step-mother Beth get her mouth duct-taped was the best part of the day. "I think I hear birds," he joked. "I never heard them, before."   So why did the Chapmans join the NOH8 Campaign? "It's about peace and love and togetherness," said Dog. "So while politicians are doing their thing, we're gonna do our thing."   "Dog The Bounty Hunter" airs Wednesdays at 10 p.m. EST on A&E.   More info and video coverage at http://www.huffingtonpost.com/2012/02/09/dog-the-bounty-hunter-supports-gay-marriage-video_n_1265072.html