Consider the following (my emphasis):
As of this writing (only a few days before the election) we believe that the chances of a definitive “call” for who will be the president by 2 am Eastern Time is a 50/50 chance at best.
To me, this is saying that the person doesn't know (or isn't saying) the odds of a result by 2am ET, but whatever they are, they are less than 50/50. No justification is given as to why 50/50 would be the upper bound, or indeed why there is no actual estimate of the odds.
OK, so I'm being really pedantic, and it's just one sentence anyway, and really, what does it matter?
Well, it matters because this quote is from a pollster, and frankly they should know (or explain) better.