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: Banning vuvuzela horns at the 2010 World Cup
 Argument: Vuvuzela sales are economically beneficial in S. Africa.
against

Topic: Instant replay in baseball
 Argument: Instant replay would better legitimize MLB and game outcomes.
in favor

Topic: Right to bear arms in the US
 Argument: Bear arms means a military/militia, not individual right.

against