Oddly enough, while their platforms are extremely similar, their supporters seem to be pretty different. Pointing out the similarities between the two and showing unity is good for progressive causes and could position one of them to take a leap should the other drop out which polling hasn't indicated would happen yet. Strategically speaking, I think this is smart (especially if there's a contested convention).
Sanders and Warren voters have astonishingly little in common
There's some generic off base speculation in the article but the numbers on second choices is the curious part.
Yeah, the polls show that most sanders voters have biden second and warren voters have harris second. Strangely, they're not really competing for the same demographic at this point.