Julian Zelizer : 2012 was a year of bitter domestic battles , especially overseas . He says the strength of GOP , the weakness of liberalism were apparent . Zelizer says the year also showed the influence of new technologies in politics . Zelizer : Year ended with a tragic reminder about need to act on gun violence .
Julian Zelizer : 2012 was a year of bitter domestic battles , turbulence overseas . He says the weakness of GOP , renewed strength of liberalism were apparent . Zelizer says the year also highlighted the influence of new immigrants in America . Zelizer : Year ended with a tragic reminder about need to act on gun control .