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.

[EX Q]: That just means their moral code doesn't fluctuate based on society's ever-changing standards."
[EX A]: Invalid

[EX Q]: There are several amendments guaranteeing rights that were not given before, and I can't see any reason why gay marriage should be any exception to this precedent.
[EX A]: Valid

[EX Q]: The economic reality, Badgett argues, is that gay and bisexual men earn between 17 and 28 percent less than similarly qualified straight men.
[EX A]:
Valid