Germany is one of America's most important allies. Nearly every American president since George W. Bush has worked closely with German Chancellor Angela Merkel. But for the first time since 2005, she will not be a candidate when Germans head to the polls this Sunday to vote for her successor. Special correspondent Malcolm Brabant is in Berlin with a preview of this upcoming election. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders