epa05139187 US Democratic presidential candidate Hillary Clinton (L) speaks as her husband former US President Bill Clinton (C) and her daughter Chelsea Clinton (R) look on, during the Democratic Caucuses night campaign rally at Olmsted Center, Drake University in Des Moines, Iowa, USA, 01 February 2016. The Iowa Caucus is the first official test of candidates seeing their parties&#039; nominations. EPA/CRAIG LASSIG +++(c) dpa - Bildfunk+++