jillian petern and dr. james densley. dr. petersonresearch consists of. >> yeah. we started looking into the life histories of perpetrators of mass shootings about five years ago. our goal was to try to understand where is this coming from, why are we seeing this increase, and who are the perpetrators? so we built a data base that includes 180 perpetrators who killed four or more people in a public space, and we coded each of them on over 200 pieces of life history information to try to look for patterns in the data. and we conducted interviews with perpetrators themselves, people who knew them, and victims and experts in the field to really try to add some data and analysis to understand where this is coming from and what werwecould do to top it. >> dickerson: dr. densley, what were able to come up with in terms of what the typical mass shooter is like? >> i think a lot of people are searching for a profile of a mass shooter. we instead saw a pathway to a mass shooting. and we outline our pathway in our book called "the violence proj

william: jillian peterson and james densely, the research and the book is called "the violence projectto stop a mass shooting epidemic." thank you both so much for your time. ♪ judy: the high-profile congressional investigation over the january 6th attack on the capitol and how to address gun violence in america are two of the issues taking center stage in this mid-term election year. to discuss the political stakes, i'm joined by amy walter of the cook political report with amy walter. and tamara keith of npr. hello to both of you. welcome to the program on this monday. let's pick up with the story we have just been hearing from william and lisa's reporting on this framework for a deal. tam, you have been watching this as it has unfolded the last few weeks. does this look like ihas a chance to become law, passed the senate, and then be agreed on and signed by the president? tamara: there is a magical number and that number is 10 republicans, and there are 10 republicans signed on to this. it has a much better chance than anything that has been discussed over the last several years. wh