TASK DEFINITION: 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.
PROBLEM: 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.

SOLUTION: Invalid

PROBLEM: I believe that marriage is about commitment and that the government should therefore grant the benefits of marriage to every committed couple.

SOLUTION: Valid

PROBLEM: Some folks argue that the laws barring same-sex marriage are not discriminatory because gay people can get married to people of the opposite sex.

SOLUTION:
Valid