'Because a lot of people who go into prison go into prison straight - and when they come out, they're gay.
He also argued that homosexuality is a choice, rather than biological. In a March 4 interview, the likely 2016 presidential contender said he believes that legalizing same-sex marriage is a decision that should be left to the states.
Homosexuality is a choice, just look at the prisons, Republican neurosurgeon Ben Carson said on CNN.
