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: Needle exchanges
 Argument: Needle exchanges protect public, not just drug addicts.
in favor

Topic: Constitutionality of US health insurance mandates
 Argument: Mandates create cartel of govt-supported insurance companies.
against

Topic: Health insurance mandates
 Argument: MA insurance mandates are performing pretty well.

in favor

