The leaker went to The Washington Post when they had some damaging audio tapes on the conservative. There were clearly no need to go through Wikileaks. The DNC leak on the other hand were not published by the Washington Post, and I recall how the top voted article here on HN during that day said that Washington Post had been pulling articles off their site and it was only until very late on the day that they allowed any word about the incident.

But its a bit ironic to complain about a lack of leaks about the conservatives in an article about Chelsea Manning. President George W. Bush was a conservative president and the leak provided by manning through Wikileaks was criticizing the war that Bush ran. We would not be here talking if Wikileaks did not publish dumps on conservative.