  We study the opinion dynamics in a generalized voter model in which voters
are additionally influenced by two antagonistic news sources, whose effect is
to promote political polarization. We show that, as the influence of the news
sources is increased, the mean time to reach consensus is anomalously long, the
time to reach a politically polarized state is quite short, and the
steady-state opinion distribution exhibits a transition from a near consensus
state to a politically polarized state.
