U.S. Senator Bernie Sanders speaks at the opening of the 2015 National Action Network Convention in New York City

I’ll take a wild guess and say those are the liberal elitists who would have supported Warren.

Via NBC News:

When Hillary Clinton gives a speech in Houston on Thursday at a historically-black college calling for 20 days of early voting in every state, she will be reemphasizing her long-held commitment to defending the voting rights of minorities.

She will also be appealing to her political base: non-white Democrats.

In the early stages of the Democratic primary race, one of Clinton’s rivals, Vermont Sen. Bernie Sanders, has drawn huge crowds and surged in polls, although he remains well-behind the former secretary of state.

Sanders appears to have been benefited from the much-discussed divide between traditional Democrats like Clinton and those who are more liberal on economic issues like Massachusetts Sen. Elizabeth Warren.

But another divide has emerged that favors Clinton: white versus non-white Democrats. In a new Washington Post/ABC News survey, 56 percent of white Democrats backed Clinton, while 14 percent supported Sanders. Among self-described liberals, Sanders had 17 percent support, compared to 63 percent for Clinton. (Vice President Biden, who has given no indication he will run, polled in double-digits among both groups.) [….]

Among white Democrats, 56 percent say Clinton will bring “real change,” compared to a whopping 81 percent of non-white Democrats, according to the WSJ/NBC survey. A CNN poll showed Sanders with 14 percent of the white vote, compared to 5 percent among non-white Democrats.

A Pew poll in March, before Clinton formally started her campaign, showed that 74 percent of black Democrats said there was a “good chance” they would back the former first lady. Only 54 percent of white Democrats agreed with that statement, with many of them (34 percent) opting with the less enthusiastic “some chance.”

Sanders disproportionate support among whites and liberals is an advantage early in the primary process because it starts in Iowa and New Hampshire, two overwhelmingly-white states. In Iowa, 93 percent of the Democratic electorate was white in 2008.