When will the mainstream media call McCain a liar?

Over at TPM Reed Hundt writes about the many lies that John McCain has been telling the American public, and wonders about something I’ve been thinking about recently:

In 2000 Al Gore was pilloried by the mainstream media (“MSM”) for his alleged untruths or exaggerations — Love Canal, Love Story, Internet, Who he visited in Texas. In every instance, at the very most he had chosen the wrong word or failed to clarify the misunderstandings of others.

Now in 2008 the McCain-Palin ticket revels in inaccuracy, wallows in whoppers, lies like a pair of rugs, buys ad time to tell still more lies. So tell me why the MSM doesn’t talk about their dishonesty endlessly, turning them from celebrity stars into pathological figures?

The contrast is absolutely clear. What’s the explanation?