Gay marriage and adoption aren't the same thing. Why try to twist it to be the same? It should be up to the state unless you can point out Constitutional adoption rights.
What are you talking about? No one said that they are the same thing. HOWEVER.....just as with marriage, if gay people are going to be treated differently than straight people with respect to adoption, in the absence of a compelling state interest to do so- it is DISCRIMINATION.
And, as with marriage, if the state will not protect people against discrimination, it is necessary and appropriate for the federal courts to step in and apply the US constitution.
In addition, children also have rights-the right to a stable and secure home. The right to be adopted when that would benefit them. There are children who are already in the care of gay people but who can't be adopted by that gay persons partner as a second parent in Miss. As such those children are being treated differently than the children of heterosexuals and that too is discrimination.
No, just as with marriage, there is nothing in the constitution about adoption. There does not have to be.