We were contacted by a reader who points out that some people on Livejournal have been pondering a rather perplexing advertisement from page 13 of today’s Express. The ad is for The Grove at Arlington, a new condo development a hop and skip across the river. The ad looks normal enough, spare an errant headline that is causing a stir: “Suburban Housing Developments are Conformist Political Death Traps.” When we called the number listed, the…