Gates is fine, Hillary not-so-much
Clinton, if anything, is more problematic than Gates and potentially the most trouble of all simply because there's little doubt that Gates knows how to subordinate himself to his President's overall direction while still keeping his own end of policy debates respectfully strenuous. Hillary...well, we'll see.
She's a threat to... what?
Tear her party apart? Give the pres the Vince Foster/RFK treatment? Periodically when she’s feeling down, launches nuclear attacks on Iran?
Zombie memes die hard, even after Hillary delivered a speech for the ages on Obama's behalf at the convention and worked tirelessly to convince anyone who would listen to her to support the Democratic nominee, following a primary run he likened to the Bataan Death March.
No matter that. CDS, like a diamond, is forever.