Last week I went to Houston to see the rodeo. That rodeo is not like other rodeos. It’s gigantic. It goes for 20 days. There can be up to 185,000 people on the grounds in a single day and they are of all human types — rural ranchers, Latino families, African immigrants, drunken suburban housewives out for a night on the town.

When you are lost in that sea of varied humanity, you think: What on earth holds this nation together? The answer can be only this: Despite our differences, we devote our lives to the same experiment, the American experiment to draw people from around the world and to create the best society ever, to serve as a model for all humankind.

Unity can come only from a common dedication to this experiment. The American consciousness can be formed only by the lab reports we give one another about that experiment — the jeremiads, speeches, songs and conversations that describe what the experiment is for, where it has failed and how it should proceed now.