ABC News has clearly been the recipient of leaks from the IG office:
Nevertheless, ABC News has confirmed that Horowitz's draft report went on to criticize senior FBI officials, including Comey and fired FBI deputy director Andrew McCabe, for their response to the late discovery of a laptop containing evidence that may have related to the Clinton investigation. That discovery prompted the FBI's letter to Congress announcing the reopening of the Hillary Clinton email probe. Hundreds of thousands of emails had been found on the laptop of disgraced former congressman Anthony Weiner, whose wife, Huma Abedin, was a top aide to the secretary of state. It took weeks for the FBI to start analyzing the laptop's contents, and Horowitz's draft report criticized senior FBI officials for how long the laptop languished inside the bureau, sources told ABC News.
Comey didn't go after the e-mail scandal because Obama himself had committed the same crime. He used an e-mail alias (at least one), and had classified and government e-mails from Hillary on his private account.
Comey knew that if they went after Hillary, it would bring down Obama and half of the government.