I’M finished with the Reagan Democrats of Macomb County in suburban Detroit after making a career of spotlighting their middle-class anger and frustrations about race and Democratic politicians. Bill Clinton wrote in his autobiography that my “extensive research on the so-called Reagan Democrats and what it would take to bring them home” was the reason he hired me as his pollster for his presidential campaign.

For more than 20 years, the non-college-educated white voters in Macomb County have been considered a “national political barometer,” as Ronald Brownstein of National Journal described them during the Democratic convention in August. After Ronald Reagan won the county by a 2-to-1 margin in 1984, Mr. Brownstein noted, I conducted focus groups that “found that these working-class whites interpreted Democratic calls for economic fairness as code for transfer payments to African-Americans.” So what do we think when Barack Obama, an African-American Democrat, wins Macomb County by eight points?

I conducted a survey of 750 Macomb County residents who voted Tuesday, and their responses put their votes in context. Before the Democratic convention, barely 40 percent of Macomb County voters were “comfortable” with the idea of Mr. Obama as president, far below the number who were comfortable with a nameless Democrat. But on Election Day, nearly 60 percent said they were “comfortable” with Mr. Obama. About the same number said Mr. Obama “shares your values” and “has what it takes to be president.”

Given Macomb’s history, this story helps illustrate America’s evolving relationship with race. These voters, like voters elsewhere, watched Mr. Obama intently and became confident he would work for all Americans and be the steady leader the times required. But focusing on the ways that Macomb County has become normal and uninteresting misses the extraordinary changes taking place next door in Oakland County  a place that played a bigger role in Mr. Obama’s success and perhaps in an emerging national Democratic ascendancy.