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]: Except blacks were barred from marriage to those that white people could marry, and white people were barred from marriage to those that black people could marry.
[EX A]: Valid

[EX Q]: Nevertheless, I think that if people are using guns to kill people, the people using them are to blame, at least more so than anyone else.
[EX A]: Invalid

[EX Q]: We have to agree to disagree if a new gay marriage law is a personal right, or if it is a public decision.
[EX A]:
Valid