Ebola is his presidency in a petri dish. It’s an example already of his tendency to talk too loosely at the outset of things, so that his words come back to haunt him. There was the doctor you could keep under his health plan until, well, you couldn’t. There was the red line for Syria that he didn’t have to draw and later erased.

With Ebola, he said almost two weeks ago that “we’re doing everything that we can” with an “all-hands-on-deck approach.” But on Wednesday and Thursday he announced that there were additional hands to be put on deck and that we could and would do more. The shift fit his pattern: not getting worked up in the early stages, rallying in the later ones.

It’s more understandable in this case than in others, because when it comes to statements about public health, the line between adequately expressed concern and a license for hysteria is thin and not easily determined. Still, he has to make Americans feel that he understands their alarm, no matter how irrational he deems it, and that they’re being leveled with, not talked down to, not handled. And he has a ways to go.

“If you were his parent, you’d want to shake him,” said one Democratic strategist, who questioned where Obama’s passion was and whether, even this deep into his presidency, he appreciated one of the office’s most vital functions: deploying language, bearing, symbols and ceremony to endow Americans with confidence in who’s leading them and in how they’re being led.