538 on Warren v Sanders
(It is worth noting that Nate Silver has had a some run ins with the Sanders' campaign and is not particularly well disposed towards them.)
538: What Were Watching For In The Second Democratic Debate
https://fivethirtyeight.com/features/what-were-watching-for-in-the-second-democratic-debate/
natesilver: Sanders probably maybe definitely needs some of Warrens current voters to have a shot at the nomination. It doesnt necessarily mean he needs to go after her, though, which could fairly easily backfire.
His staff, at times, has seemed a little prickly about Warren. Maybe they thought it was Sanders turn he was the second-place finisher last time, after all. But shes the one who seems to have momentum and whose chances the media is taking more seriously.
But, again, that doesnt necessarily mean its a good look for Sanders to go after her. Im not sure what hed even say, exactly.
He has, at times, tried to emphasize his electability vis-a-vis Warren, a strategy that I think is a bit dubious.
nrakich: I feel like that wont win him a lot of friends among people who already dont like the way he treated the last woman he faced in a primary.
natesilver: He has sometimes tried to act like he was the OG Democratic Socialist and shes stepping on his turf, which I dont think is a particularly compelling message either.
julia_azari: One thing I want to note about Warren and Sanders is how we (media, voters, everyone) understand what goes on within parties in a nomination contest. Because you essentially have two people competing who have somewhat different approaches to their shared ideological lane ... Its kind of remarkable that were seeing public contestation at this level not just between factions but within them.