In one of the numbers from “Fiddler on the Roof,” Tevye sings, with a mixture of emotions: “We haven’t got the man ... we had when we began.”

Back in January when Barack Obama pulled off his stunning win in the Iowa caucuses, and people were lining up in the cold and snow for hours just to get a glimpse of him, there was a wide and growing belief  encouraged to the max by the candidate  that something new in American politics had arrived.

His brilliant, nationally televised victory speech in Des Moines sent a shiver of hope through much of the electorate. “The time has come for a president who will be honest about the choices and the challenges we face,” said Senator Obama, “who will listen to you and learn from you, even when we disagree, who won’t just tell you what you want to hear, but what you need to know.”

Only an idiot would think or hope that a politician going through the crucible of a presidential campaign could hold fast to every position, steer clear of the stumbling blocks of nuance and never make a mistake. But Barack Obama went out of his way to create the impression that he was a new kind of political leader  more honest, less cynical and less relentlessly calculating than most.