A campaign aimed at apologizing for the anti-gay rhetoric of some Christians returned to Chicago Pride for a fourth year.

The Marin Foundation describes its I'm Sorry campaign as “the original activism of love apologizing to the LGBT community for the ways Christians have caused harm. We view this campaign as our commitment to making the first step towards relational reconciliation in a tangible way.”

In 2010, Andrew Marin wrote a post apologizing for his former homophobic ways. In I Hugged a Man in His Underwear. And I'm Proud, Marin described his elation at hugging a Chicago Pride paradegoer who was in his underwear. The post and accompanying photo went viral.

Marin Foundation Executive Director Michael Kimpan told gay glossy The Advocate that “there is a need for some folks to acknowledge the harm done toward the LGBTQ community in the name of God and religion.”

“The I'm Sorry campaign provides such an opportunity, to offer an apology and reparations face to face, building bridges of reconciliation between those who once spoke words of hate and intolerance and now desire to speak words – and actions – of love,” he said.

At Chicago's annual pride parade, members dressed in “I'm Sorry” t-shirts lined up behind police barricades holding signs which read “I used to be a Bible-banging homophobe – Sorry” and “I'm sorry for how the church has hurt you.”