He presided over a political party whose platform was openly hostile to the basic principles of equality at the foundation of the USofA.
He led the re-election team for Jr Bush in 2004 which had, at it's core, a campaign strategy of fear and hatred - with one of the main themes being the demonization gays and gay marriage in order to motivate voters.
From Ambinder at The Atlantic:
"It's taken me 43 years to get comfortable with this part of my life," said Mehlman, now an executive vice-president with the New York City-based private equity firm, KKR. "Everybody has their own path to travel, their own journey, and for me, over the past few months, I've told my family, friends, former colleagues, and current colleagues, and they've been wonderful and supportive. The process has been something that's made me a happier and better person. It's something I wish I had done years ago."What a dick.