MEGAN MCARDLE: Give Me Liberty And Give Me Death? “Selection bias will produce good results for the selecting organization, but you cannot replicate its results on a nationwide scale; fat, smoky people have to work somewhere (or go on welfare). If this became common, you’d see legislative pushback in the form of discrimination lawsuits and legislation. I’m betting there are more obese workers/voters than there are people who hit the gym five days a week.”