....he is an ex-Hillary Clinton staffer.....
Was he not tenured? How does one become an exHillaryite?
He is, unlike Vince Foster or Ron Brown et al, still alive.
Being an ex Clinton staffer is akin to one renouncing Islam.
How does one become an exHillaryite?
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Conveniently resigns for as long as he needs to say that he is not a part of her campaign. Depends on the meaning of “is”, of course.