At Hillary Clinton’s hearing for secretary of state, she promised she would take “extraordinary steps…to avoid even the appearance of a conflict of interest.” Later, more than two dozen companies and groups and one foreign government paid former President Bill Clinton a total of more than $8 million to give speeches around the time they also had matters before Mrs. Clinton’s State Department, according to a Wall Street Journal analysis. Fifteen of them also donated a total of between $5 million and $15 million to the family’s foundation. In several instances, State Department actions benefited those that paid Mr. Clinton. The Journal found no evidence that speaking fees were paid to the former president in exchange for any action by Mrs. Clinton. Still, Mr. Clinton’s activities pose a unique challenge for Mrs. Clinton’s presidential campaign.