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: One of the interesting developments in recent years has been the rush by people in many states to amend their marriage statutes so that they explicitly say that marriage is between one man and one woman.

SOLUTION: Valid

PROBLEM: These battles are going to be fought on different fronts.

SOLUTION: Invalid

PROBLEM: One point of defining marriage as a heterosexual union is that it allows statistical inferences about procreation without inquiring about fertility.

SOLUTION:
Valid