Odette Youssef

The NewsGuard YouGov poll surveyed 1,000 Americans.

It asked about the incident at the dinner, as well as incidents at a Trump rally in Butler, Pennsylvania, and on golf grounds in West Palm Beach, Florida.

30 percent of respondents thought at least one of those was staged.

Across all three events, Democrats were most skeptical of the Butler incident, with 42 percent saying they thought it was staged.

NPR's Adet Youssef.

But this is really one area where the political left seems to be very susceptible for, you know, believing this types of baseless narratives.

Allen's family members have told reporters that he was a radical leftist.

NPR has not independently confirmed these reports.

But Jared Holt, an online extremism analyst with Open Measures, says writings and social media accounts believed to be associated with Allen paint a different picture.

Holt says that unlike some of the prior assassination attempts against Trump, the writings do not indicate that Allen was immersed in extreme or conspiracist information systems online.

Odette Youssef, NPR News.

I'm Odette Youssef.

I cover domestic extremism.

And I'm Barbara Sprent.

I cover Congress.

I'm Odette Youssef.

I cover domestic extremism.

And I'm Barbara Sprint.

I cover Congress.

Social media companies have largely pulled back on content moderation.