That's not exactly honest, is it? I mean, if you're talking about me for instance, my point all along has been that "people who don't have advanced degrees, let alone people who never went to college," aren't really going to care about where OP goes to law school.Most of them live in a small, insulated world in which they rarely speak to people who don't have advanced degrees, let alone people who never went to college.
I agree with you that he should go to Harvard. But not on the basis of its "lay prestige (for voters)", in the words of OP. Bad reason. It's not that voters won't be impressed by Harvard on paper, but they just wouldn't care enough to favor it over Yale. And like I said, actually parading a Harvard JD around could end up wreaking of elitism in the eyes of voters in certain areas, and so if anything, to play it safe he should want to keep it on the down-lo (absent, like Obama's, special circumstances).
But to reiterate: successful candidates do NOT generally use the prestigiousness of where they went to law school--nor, most of the time, even that they were lawyers--as a credible selling point to voters in 2010 Mainstream America.