@amic I haven't seen that (still mostly avoiding politics, except one candidate at a time for research) but he's been mollycoddled up until now (by both party leadership and the media) because the establishment fears chasing off his large and active base.
If there's really anything they can pull out and use against him, I'd be surprised. He seems to have mostly tried (unsuccessfully, I might add) to push most of the same things since his first election and to live by the standards he would set.