"And I am aware of three studies (elsewhere) that showed no harm, " he wrote in an e-mail.

CNN: Ethanol: Is it friend or foe?

On one side of the debate are advocates such as Kathy Godbout, 61, who says the past three years prove that letting gays marry does no harm to heterosexuals such as herself.

NPR: Looming Legal Fight Clouds Gay Marriage Milestone