I know this sounds very cynical, but it's likely that most of these premature election calls for democRATs by the MSM are intended to demoralize GOP turnout on the West Coast, where polls are still open. Republicans in the far West are going to have to learn to not listen to the news until after they vote, because this will only get worse in the future. I don't think these "calls" will have any significant effect on turnout, because I think very few people listen to the election news until after they vote. People vote in the morning before work or on their way home from work, then listen to the results.
"...but it's likely that most of these premature election calls for democRATs by the MSM are intended to demoralize GOP turnout on the West Coast, where polls are still open..."
I live on the West Coast and it's a very common tactic by the MSM scum - has been for a long time. I live in Oregon, and it's totally 'vote by mail' - or 'vote by mail-fraud' to the cynical :-) - which helps negate that here since most of us have already mailed in or dropped off the ballots. But, Washington, Cailfornia and the Mountain time zome states can be seriously affected.