PORTLAND — The trial of a man who led a standoff at an Oregon wildlife refuge has raised many complicated issues, some of them political. But federal prosecutor Ethan Knight told a jury Tuesday during closing arguments that the case comes down to common sense and one simple fact: “They made a choice to take over someone else’s workplace.” Ammon Bundy and six co-defendants have been charged with conspiring to prevent federal employees from doing their jobs at the Malheur National Wildlife Refuge by seizing the refuge Jan.