Now that Trump is the Republican nominee everybody says that Clinton will have an easy win.
I would not be that sure. Trump represents an idea. The idea that the USA (and the West) is now governed by a self serving plutocracy that care nothing about the average person.
And no one represents better the establishment than Clinton with all her multi milllion dollar speeches to banks, corporations and governments.
I would not surprise if Trump now start moderating his speeches and also if the voters of Sanders (the other anti establishment candidate) go to Trump.
As thousand of bombs show that you cannot kill an idea (reference to Al Qaeda and IS), also Trump represents a (very different) idea.
So the battle Trump vs Clinton will be just decided in November, regardless of what the polls say.