Bill and Hillary Clinton have earned $6.7 million from paid speeches since the beginning of 2015, including $2.7 million from speeches the former president gave after his wife officially kicked off her White House bid last April, according to a financial-disclosure form Mrs. Clinton’s campaign released on Tuesday. Mr. Clinton was paid $285,000 to speak to America’s Health Insurance Plans, the trade association for health insurers, in June 2015. He was paid $200,000 to speak at Stephens Inc., an Arkansas financial-services firm run by Warren Stephens, a major Republican donor. And in September 2015, he was paid $225,000 to speak...