March 10 Democratic primary live results

These six states are home to nearly 9% of all Americans, roughly 28.7 million people, and represent distinctly different parts of the country's demographic mix.

Black Americans are a key component of the Democratic coalition. Mississippi has the largest percentage of any state. Idaho has one of the lowest.

All six have relatively small Latino populations, a potential disadvantage to Bernie Sanders, who has excelled at attracting Latino voters.

Residents in four of the six states voting today make less than the rest of the country, including Mississippi, the poorest state in the U.S., where nearly 1 in 5 households live in poverty. Washington state is the wealthiest of the group with a median household income of $70,116.

That disparity is mirrored in data tracking education levels. Washington ranks near the top in college education. Mississippi is near the bottom.