New poll.
Fifty-three percent of Democratic primary voters say they back the former secretary of state, while 42 percent of them support the Vermont senator.
Summary of cross-tabs:
In the new poll, Clinton leads Sanders among minorities (62 percent to 33 percent), women (58 percent to 39 percent), primary voters ages 50 and older (62 percent to 31 percent) and self-identified Democrats (58 percent to 37 percent).
Sanders, meanwhile, holds the edge among white men (54 percent to 41 percent), independents (61 percent to 33 percent) and primary voters under the age of 50 (57 percent to 40 percent).
Barriers of each candidate:
Asked what concerns them the most about Clinton, 22 percent of Democratic primary voters cite her ties to Wall Street and speaking fees, while just 7 percent believe it's the controversy over her private email server; 66 percent say neither issue is a major concern.
Asked what concerns them the most about Sanders, 26 percent say it's his lack of foreign-policy experience, 23 percent say it's his policy proposals that are out of the mainstream (and that make it difficult for him to beat the Republican nominee) and 47 percent say neither is a major concern.
The NBC/WSJ poll was conducted Feb. 14-16 of 800 registered voters (margin of error of plus-minus 3.5 percentage points), 400 Democratic primary voters (plus-minus 4.9 percentage points) and 400 GOP primary voters (plus-minus 4.9 percentage points).