The Obama administration is unveiling new rules that grant nearly all marriage benefits to same-sex couples nationwide. Federal marriage benefits have so far only been available to same-sex couples in states where gay marriage has been legalized. But the Obama administration’s move makes them available across all federal agencies in all states. The changes include applying federal immigration law equally to gay and heterosexual couples, and Internal Revenue Service recognition of gay marriages. Federal employees in same-sex relationships will obtain health insurance for their spouses and the right to take a leave of absence in the case of illness.