In this June 7, 2016, file photo, former President Bill Clinton, left, stands on stage with his wife, Democratic presidential candidate Hillary Clinton, after she spoke during a presidential primary election night rally in New York. His popularity among Democrats is off the charts, he's a fundraising powerhouse and his administration is hailed by many as a high-water mark of economic prosperity. Without question, one of the key assets in Hillary Clinton's second campaign for the White House is her husband, Bill. And yet, there are still times when the former president can step in it. (AP Photo/Julio Cortez, File)