Article snippet: WASHINGTON — Elizabeth Warren is gaining ground on Joe Biden and has pulled ahead of Bernie Sanders with the help of a groundswell of enthusiasm among liberal Democrats, a poll released Tuesday shows. The NBC News/Wall Street Journal poll of national Democratic primary voters is the first major survey since last week’s debate in Houston, which featured a smaller field of 10 candidates. Biden leads with 31 percent, with Warren at 25 percent and Sanders in third place at 14 percent. Warren has gained 6 points in the poll since July. Much of that support comes at the expense of Kamala Harris. who is down 8 points since July. She now has 5 percent support and has dropped to fifth place behind Pete Buttigieg, who had 7 percent. Among liberal Democrats, Warren leads with 36 percent — 17 points higher than either Biden or Sanders. And she has an edge in voter excitement: 35 percent of respondents say they’re enthusiastic about her, compared with 25 percent for Sanders and 23 percent for Biden. The poll was conducted Sept. 13-16 and has a margin of error of 4.4 percentage points. Digital Access Home Delivery Gift Subscriptions Log In Manage My Account Customer Service Help & FAQs Globe Newsroom Advertise Newsletters View the ePaper Order Back Issues News in Education Search the Archives Privacy Policy Terms of Service Terms of Purchase Work at Boston Globe Media Link to the full article to read more