It has been reported in the media (e.g. RT, BBC) that the US has requested the extradition of Julian Assange from the UK to stand trial for the charge of conspiracy to intrude into a computer system (I hope I'm getting the wording correctly here).
Now, regardless of other possible charges ("sealed indictments" etc.) - what is the history of journalists/publishers being charged with this offense or similar ones regarding their interaction with sources? Are there binding precedents at the national level? Have any courts considered the constitutionality of such charges in various situations? Or of the means in which the government obtains evidence about seemingly private conversations of journalists and their sources?
Note: This question is about the USA, not the UK.