instruction:
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.
question:
One of the interesting developments in recent years has been the rush by people in many states to amend their marriage statutes so that they explicitly say that marriage is between one man and one woman.
answer:
Valid


question:
This *was* the law 50 years ago, and it was vigorously defended by religious and legal scholars, until finally that law was overturned and the civil right to marriage was extended to everyone regardless of their race.
answer:
Valid


question:
Only heterosexual acts and unions can actually produce offspring - so gay unions aren't really producing new taxpayers and citizens at all - their relations with the opposite sex are producing new taxpayers and citizens.
answer:

Valid