Oh, please!
"Traditional" marriage has the following elements
1) It is permanent. Divorce is not permitted, and if it is, remarriage is not recognized.
2) It is sexually exclusive. Adultery is a crime. Alienation of affection is a tort where it is not also a crime.
3) In the case of separation or abandonment, children belong to their father. Unmarried women who become pregnant may not retain custody of the child, if born alive, UNLESS they have the means not to become a public charge.
THAT is traditional marriage, and the number of people who support it couldn't fill Giants Stadium for a rally.
When has that been traditional marriage in America?
Even Thomas Jefferson dabbled in divorce law.