Oh, are the Koch brothers journalists now?
They do contribute funding to journalism. The publishers of
The Nation are also a corporation and attempts to influence the results of elections. It's hard to find a clear division between the press and political advertising. Certainly none existed during the period when the First Amendment was written. Newspapers were partisan or factional documents, and political communications - other than what was spoken directly - literally were printed on a press. Freedom of the Press isn't limited to what Congress decides is objective journalism.