Here's the important passage in Edelman's letter.
Premature and public discussion of the withdrawal of U.S. forces from Iraq reinforces enemy propaganda that the United States will abandon its allies in Iraq much as we are perceived to have done in Vietnam, Lebanon and Somalia. … Such talk understandably unnerves the very same Iraqi allies we are asking to assume enormous personal risk in order to achieve compromises of national reconciliation. …
Kaplan perceptively argues that what Edelman is doing is making the equivalent of a treason accusation against Hillary Clinton and that Edelman's treatment of Hillary might cause the Bush administration more trouble with the Senate and with female voters.
What Kaplan does not recognize is that Eric Edelman, Rush Limbaugh, and Sean Hannity all believe that Hillary Clinton in fact is committing treason when she advocates troop withdrawals. For right-wing audiences reinforcing "enemy propoganda" (what little there is of it) is a form of "aiding and abetting the enemy" under the definition of treason in the constitution. Likewise, they think of the Lincoln administration's suspension of habeas corpus, closing of pro-Confederate newspapers, and arrest of prominate pro-Southern political figures provides historical precedents for treating people like Harry Reid and Hillary Clinton as traitors.
What stops the Eric Edelmans of the Bush administration from openly advocating the arrest of
people like Hillary Clinton is their sense that they don't have the power to make it stick. But, that's really the only thing.