The answer, of course, is that he'd crack under the strain.

Via Instapundit, Michael Graham imagines a pretty funny scenario:

I have a dream for Sen. Barack Obama.

I have a dream that one day, for just 24 hours, he could be Sarah Palin.

OK, maybe that’s less of a dream and more a plot point from a bad Lindsay Lohan movie (redundancy alert!).

But imagine the Democratic nominee’s day as Barack Palin Obama:

He wake up and reaches for a secret cigarette and a copy of The New York Times [NYT]. Instead of the usual partisan puff pieces (“Obama Health Care Plan Pledges Miraculous Healings For All”), the Times is running exposes about his family. This is, of course, mostly the media’s fault: much as I’d like to blame the candidate for letting himself be made like unto a god by the press, could we have really expected him not to fall into that insidious, but short-term useful, trap? Senator Obama has never before been subjected to even the comparatively mild criticism that he’s been confronted with this election cycle (yes, I said “comparatively mild:” read the op-ed again if you’re still in need of a proper baseline): with that criticism comes a certain basic immunity to the more egregious forms of nonsense. So, yeah, the sudden switch would probably snap him like a twig. Fortunately for him, a sudden switch like that is almost certainly a fantasy scenario.

Anyway, the real problem is that, should the man become President, he will immediately be subject to strains and tensions that dwarf anything that he has encountered anything thus far. And when – not if – he does something wrong, Americans die.

And there are no mulligans in this business.