cynthia miller eidris, she said in all of my past work, it was parents coming to me and saying, how do i keep my kids from getting radicalized on reddit. and now it is how do i keep my parents from getting radicalized on facebook. the research isn't there yet. obviously they're working on it. it's so interesting because it has entirely flipped what people who study extremism work on. >> fortesa latifi, thank you. appreciate it. >> thanks for having me. bernie sanders ally vowing that president biden will get a progressive challenger for 2024. primarying the president. our political director, david challenge on, joins us next. later, dogged determination. the real-life lassie who may have saved her owner's life during a brutal car accident.