Donald Trump's victory in the U.S. presidential election was cause for celebration among Europe's largest anti-establishment political forces. Party leaders from France's National Front, Italy's Five Star Movement and the Netherlands' Party of Freedom, thrilled by his demonstration that the political and media establishment can be thwarted, offered congratulations to the president-elect. Like Trump, they hope to ride the wave of anti-establishment fervor building on both sides of the Atlantic to power in 2017, when some of the European Union's biggest economies will hold national elections....