I don't really get the obsession with the popular vote count. We know he lost it, by a reasonably small margin. That's enough to negate the legitimacy of his mandate. Why are the particular numbers relevant?
The greater the popular vote disparity, the deeper it undercuts his perceived mandate. If she won the popular vote by 100k it would be perceived as less of a moral victory than if she winds up winning it by 2.5 million.