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.

Americans 100 years ago commonly argued that immigrants should not receive equal treatment under the law because they were allegedly morally inferior to native-born white Americans.
Valid

Then twist around words to fit in this weird idea you have that somehow gays are discriminating against you by wanting to get married.
Valid

If gay people never formed families themselves, and never had children to look after, one could make an argument that gay marriage was an unnecessary concept.

Valid