As John Podhoretz points out this morning, CBS was so eager to slam George W. Bush that they staked their reputation on an obvious fraud: CBS’s Big Blunder.

CBS made the four documents available in their original form on its Web site Wednesday night.

And by yesterday morning, they were being examined with a fine tooth comb.

The Minneapolis lawyers who run powerlineblog.com were on the case early. Two of the blog’s readers directed their attention to a note left on an Internet bulletin board on the freerepublic.com Web site — the 47th posting on the topic there.

Post No. 47 pointed out that there was something off about these documents from the 1970s: The spacing between the letters and the words was proportional, and only a few IBM electric typewriters could achieve that effect back then.

From there it was off to the races. Once anyone who had had experience writing and typing in the 1970s began examining the documents, it was impossible not to see some weird anachronisms that suggested they had been crafted not on a 1970s typewriter, but using Microsoft Word.

Charles Johnson, who runs the wonderful littlegreenfootballs.com, simply typed one of the memos over using Microsoft Word’s New Times Roman font and, lo and behold, the document came out exactly identical to the one on the CBS site, down to the letter spacing.

The documents contain such features as superscript lettering, which is done automatically by Microsoft Word, and curly quotation marks. A brief glance at a Web site called selectric.org, run by an amateur typewriter fanatic, reveals dozens of IBM electric typefaces — and none of them has curly quotation marks.

By 3 o’clock, the very careful and honest Jim Geraghty, who produces invaluable material every day on nationalreview.com’s Kerry Spot, was saying flatly, “CBS had better have one heck of a defense for this.”