Bush Jr strikes me as INFP.
He has been praised for his good sense in selecting people (fits with INFP) and i doubt "lack of foresight" could be attributed personally to him as distinct from his administration. The aggressive foreign policy etc. can be explained by beta values coming to the fore.
I believe Obama & Clinton to be ENFJ.
Oddly enough given the realities of modern american politics i can see a long stream of ENFJ/INFP presidents .... all other types face major pitfalls. Thinkers will inevitably alienate large sections of society with outspoken attitudes and feelers outside of Beta will find it difficult to garner the necessary support from the powerful (which i will assume to tend toward Beta).