hanover germany members anti-immigrant alternative germany afd party elect right-wing nationalist co-leader saturday signal possible toughen tone regional vote next year party congress choose alexander gauland defend afd member say history rewrite focus german victims world war two return post hold 2015. members deliberate thousands anti-afd protesters march outside carry placard read hanover nazis stand racism early riot police fire water cannon dozens protesters block road lead congress underline divisive impact party since enter bundestag low house first time sept. 24 election party incumbent leader jorg meuthen see relative moderate movement enough vote keep post vote drag even join co-leader gauland run post last minute another candidate see moderate georg pazderski fail win enough vote leadership vote meuthen praise party often beset internal strife show unity two senior members quit september protest saw unstoppable populist streak people country say actually manage something meuthen tell delegate put new twist chancellor angela merkel wir schaffen das message doubt germany deal record influx migrants 2015. thousands protesters march peacefully outside afd delegate watch short film paint gloomy picture europe large economy overrun beggar stone-throwers muslims found 2013 vehicle oppose euro zone bailouts afd poll around percent nationally two years ago eve refugee crisis arrival 1.6 million people seek asylum two years end 2016 help morph anti-immigrant party seat 14 germany 16 regional parliament poll suggest win seat next year regional elections southern state bavaria western region hesse would give foothold germany state parliaments gauland replace frauke petry quit become independent member parliament sudden departure two days afd become first far-right party win seat bundestag since 1950s expose rifts whether party ditch rhetoric include statements say islam compatible german constitution germany 's far-right afd choose nationalist co-leader