Good question Deborah! This all started back in 2000, Bush vs. Gore. Big Media called the election for Gore way, way early, before the West Coast polls had even closed. Hell, the East Coast polls hadn't even shut down yet! You know what their source for calling the election for Gore was? Exit polling, which is the absolute only way they could have called it for him. There was no way that ballots could have even begun to be counted, yet those tools called the election! Some say it was to depress voter turnout in the Western states, but it backfired on them. They started to do it again in 2004, but they suddenly remembered the egg on their faces, and semi-called the election by saying that it was exit polling. Again, they said that Kerry was winning and were really pissed when Bush won again. Stupid media LMFAO! I left you a link to PBS which chronicles the irrational exuberance of Big Media in calling the election for Gore.
Don't trust the media Deb. Just don't do it.