From a Washington Post analysis by David Byler headlined “Racial identity is more fluid than you might think”:

Many Americans assume race is a constant: something people are born into and that — like their birth date or country of origin — simply doesn’t change.

But for a surprising number of us, race is a fluid concept. Polling data show that roughly 8 percent of adults jumped from one racial category to another in recent years. And that has important political implications for the Republican Party.