In a shock poll that has pulled his national RealClearPolitics polling average to a fraction of a point over Bernie Sanders, Quinnipiac reported that Joe Biden’s support has crashed by 9 points in less than three weeks, from 26% to 17%. Sanders saw a modest increase from 21% to 25%, positioning him in first place. Michael Bloomberg saw a significant increase, jumping from 8% to 15% and coming in third place ahead of Elizabeth Warren.

As usual, any individual poll should be taken with a grain of salt. The rest of Biden’s national post-Iowa polling thus far has only seen a slight slip in his support, and it’s possible that this poll is an outlier.