A "surprising" out of left field win is likely due to the simple fact that a large amount of the population has tuned out mainstream media and is getting information from new sources that the traditional establishment pollsters and media have ignored.
This would not be a trend that is unique to Romania. On The (Canadian) Strategists podcast recently one of the strategists remarked that they wouldn't even know how to run the digital campaign they successfully ran in 2014 because the entire social media landscape has changed over. His point was that it is not at all as clear to him as it was in the past how to actually reach people.
