Bernie Sanders gets support from about half of white Democrats. That’s about it. He’s become a lot more popular lately, but Clinton still has her 80 to 85% favorability rating among Democrats. Her unfavorable rating is around 10 percent, right where it was in January. So among Democrats, Sanders’ gains are not Clinton’s losses.
Of course the press has been promoting Sanders and Joe Biden, because they want to cover a fight. It sells better. Don’t fall for it.
Bernie has some interesting ideas, but don’t confuse those ideas with beating the Republicans. Not gonna happen. If he got the nomination (thankfully impossible) he would lose to Bush III by 20 or 30%, and if he hurts Hillary, she could lose to Bush. Here’s the full story on Nate Silver’s blog.