Joe Klein and I are seeing things the same way:

Obama’s strength is inspiration, and it’s also his weakness. In the recent past, Democrats have favored candidates who offer meaty, detailed policy prescriptions — usually to the party’s detriment — and that is not Obama’s game. After his Iowa victory, his stump speech had become a soufflé untroubled by much substance of any sort. He has rectified that, to some extent. He now spends some time talking about the laments of average Americans he has met along the way; then he dives into a litany of solutions he has proposed to address the laments. But those are not nearly so convincing as Clinton’s versions of the same; of course, Clinton has a tragic deficit when it comes to inspiration.

There is an odd, anachronistic formality to Obama’s stump speech: it is always the same. It sets his audiences afire, but it does not reach very far beyond them. It is no accident that Obama is nearly invincible in caucus states, where the ability to mobilize a hard core of activists is key — but not so strong in primaries, where more diverse masses of people are involved. He should be very worried that this nomination is likely to be decided in the big working-class primary states of Ohio, Texas and Pennsylvania.