Education activists are rallying around a homeless woman who may face jail time for enrolling her son in kindergarten under a friend's address. Supporters say the woman's story is yet another dismaying example of inequality in the U.S. education system. Tanya McDowell, a homeless single mother from Bridgeport, is charged with first-degree larceny and conspiracy to commit first-degree larceny for signing up her 5-year-old son to attend nearby Norwalk schools under the address of a friend. (Her son went to the school for four months. Her friend has been evicted from public housing for letting McDowell use her address.) McDowell...