[ianch99]

From 2018 but I think it still resonates today:

Brexit and Trump voters more likely to believe in conspiracy theories, survey study shows

Close to half of respondents who voted for Brexit (47%) and Trump (44%) believe their government is hiding the truth about immigration, compared with just 14% of Remain voters and 12% of Clinton voters.

The researchers also set out to measure the extent of belief in a conspiracy theory known as ‘the great replacement’: the idea that Muslim immigration is part of a bigger plan to make Muslims the majority of a country’s population.

“Originally formulated in French far-right circles, the widespread belief in a supposedly outlandish nativist conspiracy theory known as the ‘great replacement’ is an important marker and predictor of the Trump and Brexit votes,” said Leal. Some 41% of Trump voters and 31% of Brexit voters subscribed to this theory, compared with 3% of Clinton voters and 6% of Remain voters.