My gut reaction is not taking to much from a poll trying to predict what will be this far out. There’s not much evidence they’ve been right. Also, centrist Dem insider candidates typically lose in presidential election. Electability is another con in a pragmatic wrapper. Carter, Clinton we’re outsiders with a whiff of populism. Mondale, Dukakis, Kerry ran as establishment picks that wouldn’t offend Republican sensibilities. Ditto now very rich HRC.
There’s a lot of hand wringing by the establishment these days to slow Sanders roll. Get ready to watch them latch on to any evidence of his ‘unelectabity’ as he continues to grow his base and rallies.
Apparently, Blue no matter who has a lot of asterisk and fine print.