Analysis Summary:

The article is mostly accurate, with the core claims of Horowitz's death at 86 and his political transformation being supported by multiple sources. The claim about Horowitz embracing the falsehood that Trump won in 2020 is presented as fact, which introduces bias. The claim about mentoring Stephen Miller is not directly verified by the provided sources.

Detailed Analysis:

• Claim:** David Horowitz, Leftist Turned Trump Defender, Is Dead at 86.
  • Verification Source #2: Supports the claim that Horowitz was a radical turned right-wing figure and died at 86.
  • Verification Source #3: Supports the claim that David Horowitz died at 86.
  • Verification Source #4: Supports the claim that David Horowitz died at 86.
  • Verification Source #1: Supports the claim that Horowitz transitioned from the New Left to neoconservatism.
• Claim:** Once a Marxist, he came to embrace hard-right positions, including the falsehood that Mr. Trump won in 2020.
  • Verification Source #1: Supports the claim that Horowitz transitioned from the New Left to neoconservatism, implying a shift to the right.
• The claim that he embraced the "falsehood" that Trump won in 2020 is an opinion presented as fact, introducing bias. No source directly confirms this specific claim, but it is a reasonable inference given his later political positions.
• Claim:** ...and to mentor Stephen Miller, later the Trump adviser.
• None of the provided sources directly confirm or deny this claim.

Supporting Evidence/Contradictions:

• Verification Source #2, #3, and #4: All confirm David Horowitz's death at 86.
• Verification Source #1: Confirms Horowitz's transformation from a New Leftist to a neoconservative.
• The claim about Horowitz embracing the "falsehood" that Trump won in 2020 is an opinion presented as fact, introducing bias.
• The claim about mentoring Stephen Miller is not covered by the provided sources.