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.

[Q]: A federal just has struck down as unconstitutional California's ban on same-sex marriage.
[A]: Valid


[Q]: If mental illness is a myth, the critics argue, so is physical illness[citation needed], because both categories have fuzzy boundaries and are to a large extent culturally determined.
[A]: Invalid


[Q]: Since it has been framed as an issue of prejudice, and since progressive ideals against prejudice are among the most universally appealing, people are more likely to accept the position for gay marriage without questioning it as much.
[A]:
Valid


