They have spent the better part of the last fifty years appealing to the worst aspects of the American character and it has blown in their faces. This is something that was bound to happen sooner or later. What mystifies me is the fact that it took this long.
....if you have the stomach for it.
Here is link to watch, also in its entirety, the first of three debates between Senator John F. Kennedy and vice-President Richard M. Nixon in September of 1960:
This was back in the good old days when politicians were more reasonable and civilized. Notice the tone. Both men are appealing to the intellect of the American people, to the better angels of their nature. Candidates don't even attempt to do that anymore.