A question that seems to be on everyone’s mind after the third assassination attempt on President Donald Trump on Saturday is whether the country has entered into a new, dangerous phase of political violence, and what that would mean for the country. I talked with Sean Westwood, a professor of government at Dartmouth College and fellow at the Hoover Institution who tracks acts of violence and the reaction to them. Our conversation has been edited for clarity and length. Q: Beyond the attempts on Trump, there were also the assassinations last year of Charlie Kirk, the conservative activist, and Melissa Hortman, a Democratic state legislator in Minnesota. Is political violence worse now? A: If you want to contextualize political violence today, we just have to look to the past. If we are looking at the period from 1865 to 1901, three of the nine presidents were assassinated. A comparable rate today would mean that we would have lost two or three sitting presidents since the late 1980s.…