I invite you two saltwater Yankees to take a read of the Fourteenth Amendment. The Equal Protection Clause guarantees equal protection of the law for all Americans.
The word "marriage" may not be there but if the right to marry is a fundamental right then everyone enjoys said right equally and may not be deprived of it without Due Process.
In other words, a gay person is entitled to be treated the same as a straight person.
If you lot are against gay marriage, do what I do. Don't marry gay people! It really is that simple.