A person holding poker chips. Photo: Artur Lebedev/TASS via Getty Images

A poker player named Mike Postle is under investigation for cheating during live-streamed poker games, and the fallout has produced one of the most fascinating gambling scandals in years.

Driving the news: The "investigation" is being led by a podcaster/YouTuber named Joe Ingram, who has analyzed hours upon hours of footage and is joined by an army of internet sleuths who have turned a poker forum into a detective's office.

  • The story has gotten so big that Scott Van Pelt mentioned it on ESPN's "SportsCenter" last week, describing the mystery surrounding Postle's alleged cheating as an "internet wormhole."

The big picture ... Here's The Ringer's David Hill after spending hours traveling down that wormhole:

  • "It's like a Where's Waldo? puzzle. It's so hard to find him, but once you do, you can never not see him .... And now that everyone is looking for the signs that Postle is cheating, they are everywhere."
  • "While his neighbors keep their phones on the table, he always keeps his phone on his chair between his legs .... He almost never brings his left hand up above the table. He puts his head down to glance at his phone before he makes decisions. It all seems so obvious now."

Go deeper: PokerStars owner buys Sky Betting for $4.7 billion

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Updated 4 mins ago - Politics & Policy

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Arrest over letter to Trump containing poison ricin

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.