With the Islamic State claiming responsibility for the shooting death of a policeman on Paris' iconic Champs-Élysées just ahead of Sunday's first-round French elections, social media and commentators see a change in the voting atmosphere that could benefit the far-right populist Marine Le Pen.
Why it matters: If she won the runoff May 7, it would be a seismic manifestation of the global populist and nationalist trends that propelled Trump and the Brexit.
On the Twitters: "Another terrorist attack in Paris. The people of France will not take much more of this. Will have a big effect on presidential election!" Trump tweeted this morning.