Four years after President Obama was elected the first African-American president in American history, a small minority of voters still balk at the notion of supporting a black candidate, The New York Times reported. Race remains a crucial decision-making factor for a small minority of voters—particularly, researched cited by the Times suggests, white working-class residents of regions hit hardest by the economic downturn—as President Obama heads into November's general election. "Certain precincts in this county are not going to vote for Obama," the clerk of courts for Jefferson County, Ohio told the Times. "I don't want to say it, but we all know why." Obama's senior advisers recognized that racial prejudice presents a political challenge to Obama's re-election bid, but said it was not a major source of worry, the Times reported.