Because he's polling at 9% nationally and it's gonna be 40% of the way through the calendar before he can really get any momentum and so the math just don't work to get a majority of delegates even in relatively optimistic scenarios for him.https://twitter.com/jonathanchait/status/1224844154200625153 …
That’s a pretty big IF, Nate, he’s a former Republican and somewhat outsider so I don’t see him winning a brokered convention