Under growing pressure from Democrats and aides to former President Bill Clinton, ABC is re-evaluating and in some cases re-editing crucial scenes in its new mini-series “The Path to 9/11” to soften its portrait of the Clinton administration’s pursuit of Osama bin Laden, according to people involved in the project. Among the changes, ABC is altering one scene in which an actor playing Samuel R. Berger, the former national security adviser, abruptly hangs up on a C.I.A. officer during a critical moment in a military operation, according to Thomas H. Kean, a consultant on the ABC project and co-chairman of...