Biden: Sanders has 'struck a chord with voters' in race with Clinton

By Doina Chiacu and Ginger Gibson WASHINGTON (Reuters) - U.S. Vice President Joe Biden praised Democratic presidential candidate Bernie Sanders for tapping into Americans’ concerns about growing income inequality, potentially giving the Vermont senator a boost as he gains on rival Hillary Clinton weeks before the Iowa caucuses. Sanders has argued that he is a more authentic choice to be the party's nominee as he tries to undermine Clinton's double-digit lead in national polls by gaining gr