A new study says it's the culture of certain forms of online media, not the platforms that distribute news stories, that are to blame for fake news.

Columbia Journalism Review surveyed over 1.25 million stories between April 1 and Election Day and found that pro-Trump audiences paid the most attention to polarized outlets, meaning they were more at risk for encountering fake news. CJR argues this wouldn't exist if the same technology available to both sides was used the same way, and says that the media networks on the right are to blame for the modern culture of sharing misinformation that allows public officials to get away with communicating falsehoods to the public.

Why it matters: CJR's study confirms that the culture of misinformation was made possible by technology, but was propagated widely by right-wing media strategy to use social media over traditional outlets, to communicate with constituents. Other studies, like this one from Pew, this one from BuzzFeed, and a custom study created for Axios by Chartbeat, find that right-wing officials, and media, are savvy in using social media distribution to elevate messaging to likeminded audiences.

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Updated 32 mins ago - Politics & Policy

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Illustration: Sarah Grillo/Axios

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President Trump returning to the White House from Minnesota on Sept. 18. Photo: Win McNamee/Getty Images

A suspect was arrested for allegedly "sending a suspicious letter" after law enforcement agents intercepted an envelope addressed to President Trump containing the poison ricin, the FBI confirmed in an emailed statement to Axios Sunday.

Details: The suspect, a woman, was arrested while trying to enter New York from Canada, law enforcement forces said.

Trump campaign goes all in on Pennsylvania

Trump poster in Scranton, Pennsylvania. Photo: Robert Nickelsberg/Getty Images

The president's campaign is placing more importance on Pennsylvania amid growing concern that his chances of clinching Wisconsin are slipping, Trump campaign sources tell Axios.

Driving the news: Pennsylvania, which has 20 electoral votes, twice Wisconsin's number, actually has been trending higher in recent public and internal polling, a welcome development for the campaign.