I honestly believe Sanders talks about Trump too much.
Or maybe the media just cut out the "Trump insults" from his speeches.
As I said previously, if you just say "Trump is a racist" 400,000 times, you are not going to win the Presidency.
Pete finishes every interview with a discussion of the future, and he does not come across as bitter or twisted. Pete is not creepy, and does not spend a lot of energy talking about anything but the distinction between his policies and Sanders.
I think Pete may be accelerating, and Sanders will be getting worried by his own drop in the numbers.
Sanders needs to talk about Trump more. His base may love hearing his stump speech, but most of those in the general election who would consider voting for him might do so simply because he is the alternative to Trump. He cannot forget about that and needs to incorporate as many anti-Trump focused voters into his coalition as possible. He'll always have his base, he needs to offer something to get those outside of it excited.