Three months into his presidency, Barack Obama has proven to be every bit as charismatic and intelligent as his most ardent supporters could have hoped. At home or abroad, he invariably appears to be the only adult in the room, the first American president in at least forty years to convey any gravitas. Even the most liberal of voters are finding it hard to believe they managed to elect this man to be their president.

It is impossible not to wish desperately for his success as he tries to grapple with all that confronts him: a worldwide depression, catastrophic…