Just curious, but aren't networks required to wait until polls close on the West Coast, since that could affect voting in semi-close states like Oregon, Washington? And It's such a sizable portion of the country still voting anyhow.
See the 1992 and 1996 elections
I meant to add "since 2000" in the wake of the national chaos that year. Obviously the previous 5 elections to that were landslides electorally,popular vote or both. In 2008, Obama won substantially, yet no one actually called the race until 11:00 EST when CA, OR, WA, ID, and HI had finished voting. I find it interesting.