We would like you to assess the QUALITY of each of the following argument (discussing Gay Marriage) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gay marriage. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gay marriage.

As I have said many times before I would be alright with marriage being limited to breeding age heteros because it would then exclude heteros also.
Valid

In fact it is worse, if we ban drugs and find that it was the wrong decision at least it is possible to ban them again, allowing gay marriage is a once only decision .
Valid

The first-cousin marriage movement folks argue that there is no rational basis for denying first cousins the right to marry.

Valid