As bad an idea as this tax is, whether for straight or gay couples, there's only one state in the nation justified in imposing such a marriage tax on same-sex couples, and that's Massachusetts. Gay voters in California and New York need to stand up and demand that they not be taxed as married couples until those states start to treat them as married couples.
Meanwhile, in states where there is no such tax, the problem of domestic violence amongst same-sex couples is finding a free-market solution:
In the absence of government mandates, a growing network of nonprofit agencies that specialize in same-sex domestic violence has sprung up in cities like Boston; Columbus, Ohio; Houston; Kansas City; and Tucson, Ariz. Many police departments also have started training officers to know how to respond to gay or lesbian victims.