Given the Target and Argument texts detect the stance that the argument has towards the topic. There are three types of stances "in favor", "against", and "neutral". 

Topic: Polygamy
 Argument: Polygamy undermines the traditional institution of marriage.
against

Topic: Mandatory military service
 Argument: Mandatory service fosters militarism.
against

Topic: Trans fat ban
 Argument: Banning trans fats means saving thousands of lives.

in favor