They are both so partisan (and possibly apathetic in the case of Dowd) that neither one of them can be bothered to fact-check anything that confirms their predetermined view of the world.
A blogger wrote and posted a series of fake Sarah Palin quotes as a parody a couple of weeks ago and ever since some of the quotes have been kicking around the rabidly excitable left-wing blogosphere, democratic mailing lists, and the empty heads of douche baggy actors.
That brings us back to Maureen and Matt, both of whom in a public forum repeated a quote about dinosaurs. Now, I suspect that Maureen, in her own acerbic way, made the mistake first and Matt just repeated it like a lemming but it's hard to say.
What I do know for certain is that for all of the problems with conservatives in America, they aren't quite as frothing, hysterical, fearful, petty, angry elitists as leftists are, for whatever that's worth.