Conversion therapy — a controversial psychotherapy that tries to help gay men and women become straight — is in the news again. Marcus Bachmann, the husband of Republican presidential candidate Michele Bachmann, runs a counseling clinic that reportedly provides the therapy. His wife has had to face many questions about it lately, prompting her to say Thursday, "My husband is not running for the presidency ... neither is our business."

The debate about the value of conversion therapy, also known as reparative therapy, has been raging in psychological circles for more than a decade.