[JURIST] The US Department of Justice (DOJ) [official website] announced Wednesday that it will no longer defend the constitutionality [press release] of Section 3 of the Defense of Marriage Act (DOMA) [text; JURIST news archive], which defines marriage for federal purposes as a legal union between one man and one woman, in court cases challenging the provision. Attorney General Eric Holder [official profile] acknowledged that the announcement marks a change in policy for the DOJ and the Obama administration, but…