We've gotten a tip that the well-respected pollster, Field Research Corp. (who generate the oft-cited "Field Polls"), is closing its San Francisco offices. The tipster cites the reason for the closure to be a combination of the city's new mandatory sick leave rules and past issues regarding unionization, as publicized in the Guardian by award-winning reporter G.W. Schulz last year. The tipster indicated that as of effective Aug. 8 2007, "Field Polls" will be conducted from notably burrito-deficient San Diego.