345 - The Respect for Marriage Act?

There is legislation working its way through Congress called the Respect for Marriage Act. But does this act respect marriage or redefine it? Let's face it, the definition of marriage has been changing for centuries. Marriages used to include polygamy and other relationships that are no longer legal. But does this act respect the institution of marriage, change it to make it better, or merely open the door to its degradation. Does Congress even have the legal authority to pass such legislation.