Before we get all hyped with headlines like these "Hillary Clinton has massive lead over Donald Trump in major national poll". We just need to remember that these Clinton leads are going to be exagerated as its the more acceptable thing say your going to vote Clinton. An example of this would be Brexit. Here is an aggregation of polls leading up until the actual referendum. As you can see according to these polls, remain won; but this did not happen in reality as it was more acceptable to say I'm voting to remain.

Just a quick heads up.