His gay daughter killed herself at 23. His message: “Don’t mess up like I did.”

Nathan Mathis holds up a photo of his daughter, Patti Sue, before a campaign rally for Roy Moore in Midland City, Alabama, on Dec. 11, 2017. (Jonathan Bachman / Reuters)

Last year, a clip of Nathan Mathis protesting Roy Moore in Alabama went viral. Now he’s part of a growing grassroots movement to make the South safer for LGBT people.

Last December, Nathan Mathis stood alone outside a barn in Midland City, Alabama, where a Roy Moore rally was taking place…