But in his Farewell Address, George Washington made it clear that he perceived no greater threat to the American experiment than a partisan demagogue who 'agitates the community with ill-founded jealousies and false alarms, kindles the animosity of one part against the other'

We cannot hope to change human nature. There will always be cranks and conspiracy theorists among us. But we can try to improve things - we don't have to accept the debasement of civil discourse or civic decline. We can take steps to ensure that the lunatic fringe remains on the fringe and stops bleeding into the base and then poisoning the mainstream

I believe that the far-right and the far-left can be equally insane - but there's no question that in the first years of the Obama administration, the far-right has been far crazier. In part, this comes from parties being out of power - without the responsibility of governing to ground them, the activists and the ideologues take over.

Our politics are being hijacked by a comparatively small number of people who seek to dominate the debate by screaming the loudest. They see the world as an urgent struggle between true believers and nonbelievers. They attempt to impose strict litmus tests and insist on conformity. They demonize dissent and consider all political opponents their enemies. Fear is their favourite tactic as they try to divide and conquer

Godwin's law states that the longer any online debate goes on, the likelier it is that someone will play the Nazi card. It's the rhetorical equivalent of going nuclear and stupid at the same time.

Politics follows the lines of physics: every action creates an equal and opposite reaction.

What might be good for ratings can be bad for the country. The hard-core partisans are self-segregating themselves into separate political realities. But the majority of Americans are starting to wake up to the game.