Here:

A few months back, I bought a DVD set of an old TV variety show, black and white but digitally remastered. A bit too digitally remastered, as it turned out. It would be ungallant to name the lady artiste in question, but in several alarming close-ups it's all too clear she's come back from lunch a little the worse for wear, and in one scene she looks as if she's just been woken up after sleeping in the park for a week.

Not her fault. The make-up guy was making her look good enough for 1960 monochrome UHF lines. He couldn't have foreseen that 40 years on they'd have big-screen satellite TVs and DVD players and technology that would make that little facial pimple look like Mount Krakatoa about to blow through your screen.

That's what happened to John Kerry. For 25 years, he told The Boston Globe, The Washington Post, the United States Senate, and all manner of other well-known saps about his covert Yuletide operations inside Cambodia gun-running to anti-communists with his lucky CIA hat. To verify any of this would have required a trip to specialist reference libraries, looking up stuff on eye-straining microfiche, etc. So it was easier to let the old blowhard yak away and just nod occasionally.
Senator Kerry couldn't have foreseen that Al Gore would invent the Internet, and there'd be this Google thingy, and all you'd have to do is tap in a few words and a nanosecond later it would all be at your fingertips – veterans memoirs, Cambodian history, declassified Johnson administration documents, previous Kerry "stretchers" (as Mark Twain called them).

It goes without saying that Kerry is not the only politician that's learning this the hard way.