That would imply a pro-No Deal agreement, in theory. In that case, I think you'd see the Tory vote suffer more than the pact as a whole would benefit - I'm firmly of the belief that there's a significant number of Pro-Brexit voters out there who would vote Remain in opposition to a No-Deal...
The gap's closed again recently, but the long term polling does suggest that Remain is the majority opinion (https://www.politico.eu/2019-european-elections/united-kingdom/#93494). The gap was as high as 10% in May this year, but narrowed to 5% right before the EU elections (I think, to be...