No, Bernie did the sensible thing and went behind the candidate who most supports his views, and who he worked closely with to create the most progressive Democratic platform in history, as well as helping push her personal platform farther to the left. He decided not to go behind the tangerine nightmare, the Putin and Brexit loving Jill Stein, or Mr. Aleppo himself Gary Johnson.
He understands the importance of having a left wing leader, and that under Hillary, he can pass some awesome legislation in the Congress without interference from Trump or his gang of losers.