At CNN, an article from Ruben Navarrette Jr. that explicitly spells it out: Not voting for Barack Obama is racism.

Meanwhile, some white Americans are turning themselves inside out to come up with excuses for why they’re not supporting Obama. It seems like just yesterday that these folks were arguing there is no racism in the immigration debate, and now they’re insisting there is no racism in the presidential election.

Some want to know why it isn’t racist when 70 percent of African-Americans vote for Obama but it is when 70 percent of whites vote against him.

The answer has to do with history. Over the decades, black Americans have had plenty of opportunities to vote for white people for president. And they have done so. But this is the first time that white Americans have a chance to vote for an African-American with a shot at the presidency. And what are they doing?

Many are responding quite well. Obama won the votes of many — to borrow a phrase — “hardworking white Americans — in Wisconsin, Minnesota, Iowa, Nebraska and Wyoming. But, elsewhere, as Obama said in a recent interview, people may need to get their head around the concept of an African-American even seeking the presidency, let alone winning it.