GOP presidential candidates weigh in on homosexuality

Three Republicans who have announced their candidacies for president answered questions about LGBT issues this week. Herman Cain, a former business executive, said he believes homosexuality is sinful and a choice. Rick Santorum pledged his support for amending the U.S. Constitution to ban legal marriage for same-sex couples. 

Meanwhile, former Mass. Gov. Mitt Romney (pictured) declined to say whether he believed homosexuality is a sin, but reiterated his opposition to marriage equality.