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: a brother-sister marriage is not an extreme argument as the reasons you use should apply to those kind of marriages too if you wish to talk about it in terms of "equal protection".

SOLUTION: Valid

PROBLEM: Those people who are fighting against the rights of gays to marry do not want to see same-sex couples receive any rights or recognitions of their relationships.

SOLUTION: Valid

PROBLEM: If, on the other hand, you are arguing against her position because it "harms" other people, then you are not basing your argument on the First Amendment at all.

SOLUTION:
Invalid