About this Ontario poll from Mainstreet Research
This Ontario poll was fielded by Mainstreet Research in March 2020, with a middle field date of March 20, 2020. The poll collected data from a total sample of n=1,017 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 ±3.1%, 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 (May 2019), the Ontario Liberal Party loses six points from 39% to 33%, the Ontario PC Party climbs ten points from 22% to 33%, and the Ontario NDP is down one point (variation smaller than moe).
You can read more information on this poll here.