The sometimes fleeting status of Roll Call’s Most Vulnerable Incumbent list

It’s been a weird election cycle, and one only has to look at Roll Call’s Most Vulnerable Incumbents list to see the multiple storylines playing out. Jason Dick talks with Mary Ellen McIntire and Daniela Altimari about who’s on the list, who’s leaving the list and why making a House list is so difficult. (Spoiler alert: It’s redistricting.)