The Time magazine’s (January 21) article titled ‘Osawatomie Reprised,’ reported that President Obama said his address will "be a bookend" to his Kansas speech last month, in video previewing Tuesday's State of the Union, with the quote:

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> “In a lot of ways, *my address on Tuesday will be a bookend to what I said in Kansas* last month about the central mission we have as a country, and my central focus as President. And that’s rebuilding an economy where hard work pays off and responsibility.”
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From the context of the above statement, I guess the bookend here means “a pair” or “duplication, repetition”.

But as I checked Cambridge online dictionary to make it certain, it simply defines ‘bookend’ as a noun meaning ‘an object used, especially in pairs, to keep a row of books standing vertically.’

Oxford online dictionary, in addition to the similar definition with the above, provides the usage as a verb meaning “be positioned at the end or on either side of (something): the narrative is bookended by a pair of incisive essays.”

There was another definition of ‘bookend’ in www.businessdictionary.com;

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> “In marketing, set of two matching or related commercials; one played at the beginning of a commercial break period, the other at its end. This technique aims to aid the listener's or viewer's recall of the advertised item.”
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None of the above definitions seems to suitably fit to the case of President Obama’s ‘bookend.’

Is it a popular usage of “bookend” in the sense of “another pair, duplication , repetition, reproduction, or the like” as used in President Obama’s statement?.