US election: The state that defines the American divide

Derwin Gray won't say which way he is voting. The charismatic, former NFL-playing pastor of Transformation Church doesn't want to upset the carefully choreographed racial balance of his evangelical congregation.

But as an African-American man, he sympathises with black voters who feel this election is really about race and class.

Two years ago Pastor Gray was pulled over on the highway by the police. He told me he'd done nothing wrong. The policeman, the pastor recalls, asked him brusquely: "What are you doing here?"

For Mr Gray that innocent-sounding question tipped him into a rage. He was a grown man, paying taxes towards the police officer's salary, driving on a highway also paid for with tax dollars, and driving home from preaching the gospel - he had as much right to be there as anyone.

But Mr Gray knew rage and indignation were not options. He told his 13-year-old son to put his hands up on the seat in front of him and answer the officer politely: "Yes sir, no sir."

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Mr Gray adopted the same attitude. "I didn't say what was in my heart," he told me. "I said what I needed to get us home."

Media captionUS Election 2016: Presiding over a divided flock

US Democratic presidential nominee Hillary Clinton speaks during a homecoming rehearsal at the North Carolina A^T university in Greensboro, North Carolina, on October 27, 2016Image copyrightGETTY IMAGES

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Can Clinton turn North Carolina back to blue?

The indignity of that choice still smarts, for Mr Grey and for many African Americans. It's such a common experience that the phrase "driving while black" has entered American lexicon.

Mr Gray's story is a reminder of why race is such an important part of this election campaign and particularly so here in North Carolina.

When Charlotte, the state's booming financial centre, exploded in riots in September after a black man was killed by police, many African-Americans said the event simply exposed an existing reality.