Democrats paid PPP to skew this for them. Enough said.
Legitimately cannot tel if you're being serious
This poll was paid for by a pro-union group, it's not normal PPP. That makes it an internal poll, which is basically 100% guranteed to be at least slightly skewed toward what the client wants to see. If the client sees what they want, they are more likely to hire the pollster again, so the pollster skews the poll sample or doesn't push undecideds, or both, to satisfy the client.
It's worth considering that possibility, but the fact that it is consistent with the last two polls from Missouri makes me think that there is a decent chance that it is at least close to correct.