Reince Priebus, chairman of the Republican National Committee, issued some words of advice for fellow GOPers: Get in the 21st century with same-sex-marriage issues. “We do have a platform, and we adhere to that platform,” Mr. Priebus said in a USA Today video. “But it doesn’t mean that we divide and subtract people from our party” who favor gay marriage. “I don’t believe we need to act like Old Testament heretics,” he said in the USA Today video. Rather, Republicans “have to strike a balance between principle and grace and respect.” His statements come as the U.S. Supreme Court is...