Yep, says Megan McArdle. A little, says me. "Pajama Boy is not a good ad. Whatever you think about progressives, they are in most ways perfectly normal people. Normal people do not, at the age of 26 or so, want to spend their holiday in footy pajamas, listening to their parents harangue them about fiscal responsibility. Good ads usually do one of three things: they make you want to be more like the person in the ad; they make you want to date the person in the ad; or they engage you and the maker of the ad as knowing...