Are Unreleased internals dictating Triages?

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I've heard that campaign internals are often more accurate than public polls; only the most favorable internals are ever advertised though. That may have something to do with it.

They're not infallible. In 2006, the DCCC and DNC decided after their preferred candidate lost the primary to Shea-Porter that it was hopeless to waste any resources on a lost cause like her. She won anyways.