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At CNBC's Republican presidential primary debate on Wednesday, Donald Trump will once again face a member of the news media who will act as a moderator, but who long ago wrote off his campaign to win the GOP nomination.

In July, a month after Trump launched his campaign and watched his poll numbers climb to the top of the field, CNBC's John Harwood said on Twitter that he didn't think Trump could win the nomination.

"If you are saying you don't think Trump can win nomination or election, I agree with you," Harwood said, responding to someone who had called Trump a "feckless blowhard."

Before that, Harwood said on Twitter that Trump "lacks the capacity" to inspire a movement like the one Ross Perot mobilized in 1992 as a third-party candidate.

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