I've scanned news clippings and included them as images on some profiles, and then transcribed some of the most pertinent details to be included as text in the biography section of the profile. I've found this works best for longer articles--although in some cases, depending on the material, I have transcribed huge sections of text and typed it into the biography.
So I'd say there's no hard and fast rule (except in every case, please be sure to include information about the source of the material, and cite the author, newspaper, date, and so forth). A lot depends on the content of the material, and how much general interest you feel it has.
You can take a look at how I included some fascinating historical news reports about one of my ancestors who apparently went missing for a period of time, much to the alarm of his family here:
Frank Sylvester Stieger
This was definitely the most interesting series of news articles I've yet found for any of my ancestors, and thankfully there was a happy ending--even though it seems a good deal of mystery still remained.
But if you're able to include a scanned image of the article (if you have the clipping), and also include at least some of the key transcribed text, I feel that really can add a whole lot to a biography!