Looking at the polls, this presidential election season is poised to give birth to the most racially polarized electorate in U.S. history. Whites are backing Mitt Romney in historic numbers, while Obama is garnering historic levels of support among blacks, Latinos and Asians. While the latest NBC/Wall Street Journal poll has the president in a dead heat with his GOP opponent, recent surveys show wide swings in support based on race. In other words, it looks like white voters versus everyone else. Looking at a composite of polls, Obama’s white support averages 37.9 percent, ranging from 35 percent to 41...