Gallup offers its latest demographic assessments of Republicans, but offers a key point easily overlooked in a political realm where people talk about the Democrats’ lock on the African-American vote, the importance of the Hispanic vote, etc. Gallup’s numbers indicate the composition of U.S. adults — separate from registered voters or likely voters — is 72 percent white, 11 percent black, 13 percent Hispanic.

For all the talk of a rapidly diversifying society, this is still an overwhelmingly white nation. An approval rating in the low 30s among whites — as Obama reached in September — is an extremely ominous indicator for his reelection prospects.