Hillary's "lead" may not be all that it appears. And there may be two other factors causing polls to underestimate Trump's support. Some voters may support Trump but hesitate to say so due to potential backlash from their peer groups. (Survey responses are supposed to be anonymous, but those participating in a telephone survey often cannot be sure that they are.) There may also be Trump voters who refuse to even participate in surveys for the same reason.

Voters may surprise the pollsters on election day.