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.

Eventually gay marriage will be legallize just as intermarriage has been and future generations will look down upon those who are against gay marriage now as we look down upon those who disagreed with intermarriage.
Valid

Polygamy has everything to do with religion (in particular, the patriarchal systems of certain fundamentalist cults) and nothing to do with same-sex couples wanting to commit as equals in a loving relationship.
Valid

We have been considering whether same-sex marriage does harm to people, and it's quite clear that it does not.

Valid