The most logical explanations for Hillary Clinton as Barack Obama's secretary of state are the ones we already know:

1. She is capable.
2. She is an international superstar.
3. She qualifies as a moderate voice in the Democratic Party foreign policy establishment.
4. The "Team of Rivals" thing makes for good PR.
5. Multiplication is better than division; that is, Demo Party healing.

On the other hand, for your consideration, here are two wild (but unfortunately mutually exclusive) scenarios:

1. Obama knew well that the publication of the Clinton Foundation list of donors might disqualify Hilary as a nominee, which would make O look like a gracious winner and, as an added bonus, forever end the political career of a dangerous rival. Truly Machiavellian.

2. As we now know that Princess Caroline wants the New York Senate seat, is it possible that Barack paid back his vital early supporter by rotating Hillary out of office into the cabinet, clearing the field for the next installment of the Kennedy Dynasty?

Neither conspiracy scenario is likely--but good for a chuckle.