This is how they do their work: envelope it in data and "research" and health issues (most of which, frankly, are bogus). (And, no, I can't find a link to the original study. So you're gonna have to settle for this edited version.)
The American Economic Journal abstract is here. The summary that started my mini-rant is here. But also check out Matthew Ygleias's take on it. (If they can sucker good "liberals," then they can sucker anyone). In any case, this is timely, given the thoughtful comment left by a reader in response to my previous blog entry.
Tip o' the mug to Jacob Grier, my ever-reliable source for nanny-state-insanity (who is, of course, not even remotely impressed by all the charts and powerpoint crapola).