Potential GOP presidential candidate Dr. Ben Carson speaks at Fresno church

FRESNO, Calif. (KFSN) -- A potential GOP candidate for president in 2016 made an appearance at a Fresno church on Friday.

Dr. Ben Carson was the first surgeon to successfully separate conjoined twins joined at the head.

But in recent years, he's become a popular figure among conservatives. Carson has argued that being gay is a choice and said he believes allowing or restricting same-sex marriage should be decided on the state level, rather than by federal courts.