TPM Reader AK, a dear, dear old friend, sees a different explanation ...

Forgive me if I missed you saying this on your site, but there's any easier way than a structural argument to understand why many Clinton supporters say they'll vote for McCain instead of Obama: Clinton, whom they support, and, one assumes, trust, has told them to do so. She has made the case that the pecking order, particularly when it comes to CIC, is her, then McCain, and Obama failing the threshold test. She has said the same about judgment and experience. This is a case where considering a structural -- to use your word -- double move is too clever by half. All you need to do is look at what they're being told by the Clinton camp to understand the polling numbers.