Mr Biden - who as vice president took a public stand in favor of same-sex unions well before they became legal throughout the United States in a 2015 Supreme Court decision - touted the landmark law as a rights victory.
The legislation's final adoption by Congress last week marked a rare show of bipartisanship in deeply divided Washington. "We are telling the millions of same-sex and interracial couples that we see them and we respect them." It repeals previous legislation defining marriage as a union between a man and a woman, and also protects interracial couples by requiring states to recognise legal marriages without regard to"sex, race, ethnicity or national origin".
She recalled that the 80-year-old Democrat was among the first American political leaders to publicly support same-sex unions at the highest levels of government.
When will normality return.