Wouldn't have of

I know that Language Log has already (e.g. here) mentioned the widespread would of, though I haven’t seen a whole lot about the gradual expansion of that of into uses like hadn’t of where there never would have been a have (oh! I tried to be funny and write ‘would of been’ but Word automatically turned it into 'would have been' – but at least its little pop-up offered the option of restoring it and even to “stop automatically correcting ‘would of been’” – that’s very open-minded of them!), suggesting that 'of' is becoming a general marker for counterfactual modality, but I just have to report a really beautiful example I heard on my favorite public radio station,

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http://languagelog.ldc.upenn.edu/nll/?p=1162