About this Ontario poll from Mainstreet Research
This Ontario poll was fielded by Mainstreet Research in May 2021, with a middle field date of May 16, 2021. The poll collected data from a total sample of n=1,047 Ontario respondents via IVR technology (automated calls).
The margin of error for an online sample is not applicable.
For comparison purposes, a random sample of this size would yield a margin of error [moe] of ±3.0%, 19 times out of 20 (for entire sample only) around the 50%-mark.
The regional breakdown of this poll was not made publicly available.
If we compare these national numbers with the previous poll from Mainstreet Research (February 2021), the Ontario PC Party loses ten points from 43% to 33%, the Ontario NDP climbs six points from 22% to 28%, and the Ontario Liberal Party climbs two points from 25% to 27% (variation smaller than moe).
You can read more information on this poll here.