In last Tuesday’s election, voters in Massachusetts and three cities – Oakland, California, and Montclair and Trenton, New Jersey – approved paid sick time initiatives that benefit working mothers in particular. These election results come on the heels of a slew of similar initiatives approved in the past year covering all or certain groups of workers in California and in San Diego, Washington, DC; Eugene, Oregon; several New Jersey municipalities; and the Tacoma suburb of SeaTac, according to an inventory of sick time laws compiled by the advocacy group, A Better Balance. Mandated paid sick time for employees is growing in popularity but is still unavailable to significant numbers of working mothers, who, the data show, are more often responsib…