Countdown to Looking Glass (1984)
Continuing the WWIII theme. This was the winner so far. It's essentially CVN's coverage of the beginning of WWIII. There's some behind the scenes stuff, but probably 2/3 of the movie is depicted as broadcasts, with plenty of interviews and whatnot. Kind of like a modern War of the Worlds. Adding to the authenticity is using some noteworthy people as reporters and guests, including [female broadcasting pioneer] Nancy Dickerson as the White House corespondent, Eric Sevareid, congressmen Robert Ellsworth, Eugene McCarthy and Newt Gingrich, and a few prominent political scientists, including Admiral LaRocque. What makes it actually work, though, is that the buildup is so incremental, going on over six or seven days, and each step is somewhat plausible. I wasn't buying it at first, but over time the story comes together and some of the details make it seem like it actually could have happened that way. Nowadays, not so much, but back in the early 80s certainly.
It's also kind of a refreshing look back at when broadcast journalism counted for something. Real shame seeing what it's become compared to what some of us remember.