Almost half of Democratic primary voters in South Carolina are African-American.

(CNN) — Barack Obama just won a state whose population is less than 4 percent African-American. On January 26, he will be on the ballot in a state with a considerably higher percentage of African-Americans: South Carolina, where that demographic makes up nearly 50 percent of Democratic primary voters there.

African-Americans have been intensely loyal to the Clintons, and continue to support Hillary Clinton over Obama in the Palmetto State. But that gap has significantly narrowed in recent weeks — and with this key win tonight, it's unlikely they will stand in his way there.

– CNN Senior Political Analyst Bill Schneider

(CNN) — When it comes to the winners of both party's caucuses tonight, it's an age revolt for Democrats versus a religious revolt for Republicans.

The exit polling shows an enormous generational divide between supporters of Obama and Clinton. Fifty-seven percent of those under the age of 30 went for the Illinois Democrat. But Obama won significantly smaller proportions of each successive age group. Forty-two percent of 30-44 year-olds went for Obama. That number drops to 21 percent among 41-64 year olds, and only 18 percent among voters 65 and over.

On the Republican side, exit polling shows a great divide between those voters who highly valued a candidate's religious values and those who did not. Huckabee won 56 percent of those who said religious values matter a great deal. That number drops to 30 percent who say religion somewhat matters, 15 percent who say religion doesn't matter much, and only 5 percent among those who say religion does not matter at all.

– CNN Senior Political Analyst Bill Schneider