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.

There may individuals who personally differ, of course, but their opinions are not based on evidence.
Invalid

And since they claim HIV/AIDS is a consequence of being gay, do they want  to increase the risk of infection for straight women by insisting that such women be the only marriage partners gay men are allowed to have?
Valid

He could have used his clout as the mayor of SF to help gay couples sue the state to change the law against gay marriage.

Valid