>Oh yeah, this topic will make a difference of world affairs. How is this important in which candidate to select ?

World affairs is not the only criterion by which we choose a candidate.

Making the assumption that the basic accusation (Obama pays women less for equivalent work) is accurate, you would not find that a relevant piece of information in determining which candidate to support? It may not be the final determinant but "Does he practice what he preaches?" is absolutely an important consideration.