This rather narrows the target audience
This polling Tracker from YouGov has been asked at least twice a month since the 2016 referendum and the big trend is that there has been a shift from those thinking Brexit was right to those thinking that brexit was wrong.
This matters, I would suggest, if there is to be an election which is presented as being about the People vs the Politicians as is being suggested by many commentators this morning.
For the fact is that there has been a shift in opinion in views of Brexit and that it well over a year and a half since the YouGov tracker has found a lead for those thinking Brexit was right. Public opinion has not shifted very much but it has shifted and the steady leads for Brexit wrong should be a concern.
This is the trend table from YouGov which has not been updated with the latest poll. Until about GE2017 Brexit right was mostly in the lead.
The fact, of course, is that the UK remains totally split on the issue and Johnson could be going into dangerous territory by appealing to fewer than half of the voting population.