And now the speculation starts. We may never know exactly why Karl Rove chose this moment to resign. The only thing we know for sure is that the reasons he gave weren't the real ones - to be with his family, to write a book, and because Josh Bolten told everybody to leave now or stay until the bitter end.
They're such formulaic explanations for a Washington departure that their only purpose could be semiotic - to let us know...
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