Trump looks to unify Republicans after decisive primary victory

By Ginger Gibson and Alana Wise INDIANAPOLIS, Ind. (Reuters) - Billionaire Donald Trump assumed the mantle of presumptive Republican presidential nominee on Wednesday with a message on unity that also suggested he was not going to work too hard to placate some party establishment figures angered by his outsider candidacy. The former reality television star, who has never held public office, won a commanding victory in Indiana's primary on Tuesday, forcing his main rival, U.S. Senator Ted Cruz, t