"...the writer comes clean...about all connections to a topic," either prior to or while publishing the work.
If we are talking about citizen journalism in the spirit of Thomas Payne it is critical that the definition be left broad, while retaining some degree of meaning and accountability that reasonable people can agree upon (i.e. a jury of our peers.)
One critique of Kline is on #3. If an opinion journalist adheres to #1 (full disclosure) why does it matter who they work for? Shouldn't an editor of a news organization be primarily concerned with the opinion journalists' ability to say something of relevance to their readers?