See, this:
(Kerry standing at a podium with Jane Fonda)
http://www.snopes.com/photos/politics/kerry2.asp
Is a cheap fake photo, and it still fooled several news agencies and conservatives to run with it last week.
A good fake could do worse, so any credible journalist would only use a picture with hard evidence to go along with it.
And
evidence is something noone had when they ran with the now debunked kerry affair.