This is warm-up time that is why.
But emphasis should be on my second point: the junk food media could claim Hillary is up big (which we would all doubt) and, if correct, it still wouldn’t matter. The states she wins might be very close, while the states Trump wins may be blowouts. It’s all about the electoral votes, as ManBearPig Al Gore learned the hard way. And my understanding is that it (no surprise) will come down to Colorado, Pennsylvania, Ohio, Virginia, North Carolina and Florida.