Les journalistes disent une chose qu'ils savent ne pas être vraie, dans l'espoir que, s'ils continuent de l'affirmer assez longtemps, elle deviendra vraie.
Journalists say something they know isn't true, in the hope that if they keep saying it long enough, it will become true.
Journalists say a thing that they know isn't true, in the hope that if they keep on saying it long enough it will be true.