Wikileaks probably is in the clear for the DNC and Clinton campaign leaks unless it can be proved that Wikileaks members participated in the various activities that resulted in their acquiring them. The first amendment generally shields those who publish in the US, and Wikileaks is not a US organization in any case. I am not aware that anyone has been charged in connection with publication of the material Snowden took from NSA despite the fact that much of it undoubtedly remains classified.
It is not so clear in the case of the Manning materials, since there have been claims that Julian Assange or others associated with Wikileaks may have participated in their theft. What I recall seeing, however, is that they might have provided technical advice about transfer to them or a destination to which Manning should deliver it, and that probably does not rise to culpability in taking it unlawfully from its repository. There might be an indictment, and following that a request for extradition. If Assange or others were extradited, it could be quite hard to convict them if they have a competent lawyer unless Manning helps the prosecution rather a lot.