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Thompson is a local institution—in addition to scads of magazine work, his “Richard’s Poor Almanack” is one of the few things in the Saturday Post worth looking forward to, and “Cul de Sac” stakes out an entertaining middle ground in the Sunday Post Magazine between Gene Weingarten nyuking it up and Date Lab’s throwing klieg lights on the emotionally humiliating spectacle that is the blind date. What’s baffling, though, is why Thompson’s daily “Cul de Sac” strip, which launched in the fall of 2007, runs in 70 newspapers across the country but not in the Post.