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.

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.
Valid

POTS and kettles dude since this is my thread and the topic of aids has nothing to do with why people think that they have the right to vote on my marriage.
Valid

Even though I have no issue with gays or gay marriage, JP is right - unprotected gay sex is less safe than unprotected heterosexual sex, especially in regards to HIV transmission.

Valid