That case, Masterpiece Cakeshop v. Colorado Civil Rights Commission, takes aim at a Colorado law that bars discrimination based on perceived sexual orientation in places serving the public. Jack Phillips, the owner of Masterpiece Cakeshop, says the law violates his free speech rights by forcing him to “create expression that violates his sincerely held beliefs about marriage.” The dispute has attracted a lot of attention from the business community, including an amicus brief signed by 35 companies including Amazon (AMZN), Pfizer (PFE), and Apple (AAPL), which asked the court to rule against Phillips. Another group with an interest in the...