Victor Davis Hanson, calling for a return to civility, gives some rules of decorum:
Don't call anyone a Nazi or brown shirt. Avoid shouting down a public official. Remember that there usually aren't clear good and bad political choices, just bad and worse ones. Don't get outraged at a slur against your team, if you once made the same sort of one against the opposition.
And, most of all, remember that while we're shouting at each other, the country is at war and piling up debt at the rate of $2 trillion a year — while plenty of rivals and enemies abroad are smiling as never before.