Bernie says it below. What's unclear is whether he's simply talking about his vote on the legislation itself, or his vote for cloture against the filibuster. Obviously Sanders has been a leading voice demanding that every member of the Democratic caucus at the least allow an up or down vote and refuse to take part in a Republican filibuster, but its precisely because the so-called "centrists" ignored that voice that the bill has been made into the worst-of-all-possible-worlds bill. Will Bernie feel the need to unilaterally disarm in this manner, given how its played out?
TPM reporting seems to suggest that Sanders is referring to cloture, but I haven't heard that definitively in his own words. I'll see what I can find out.
Be sure and call Bernie and tell him you support him on this: 1-802-862-0697 - or - 1-800-339-9834 (In State Only)