Herrera played key role in challenging Prop 8
Democratic leaders, Republicans absent from letter
Attorneys in Prop 8, DOMA cases prepare for next week's showdown
Company benefits must match for both same-sex and opposite sex couples
Researchers say there has been almost no research behind these trends
Justice Department calls this fourth settlement in six weeks over medical provider HIV discrimination
Heralded as next possible breakthrough in combatting the disease
Coss expects court action, but ultimately a decision to allow same-sex couples to marry
Resol'n set for introduction before city council on March 27
ABC News/Washington Post survey comes on same day Hillary Clinton backed issue