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According to a new CNN/WMUR New Hampshire Primary poll, Clinton holds an 8-point edge over Sanders, with 43% behind Clinton and 35% backing Sanders. Vice President Joe Biden clocks in at 8%, with 2% or less supporting Martin O'Malley, Jim Webb and Lincoln Chafee.

The poll marks a significant tightening of the contest since the May Granite State Poll, which included Elizabeth Warren on its list of candidates. In that poll, Clinton stood at 51%, with Warren at 20% and Sanders at 13%.

Several shifts in the poll seem to explain much of Sanders' gain. Looking at the demographic breakdown in primary preferences, men, younger voters and liberals appear to have moved broadly toward Sanders in the last month. Among men, 52% backed Clinton in the May survey, that fell to 32% in the new poll, while 47% now support Sanders. Likewise, among liberals, a 51% to 16% Clinton advantage is now a 48% to 41% Sanders edge. And among voters under age 50, Clinton has fallen from majority support to a near even split in the new poll, 37% back Clinton while 39% favor Sanders.

RELATED: Read the entire CNN/WMUR poll results

And likely Democratic primary voters are now more apt to see Sanders as the candidate who "best represents the values of Democrats like yourself." Sanders trounces Clinton, with 41% of Democratic primary voters saying Sanders does, to 30% who chose Clinton. In the May poll, 38% said Clinton was tops on this question, with 22% choosing Warren and just 13% picking Sanders.

Sanders has also gained dramatically in favorability ratings among Democrats since May. In the new poll, 66% say they have a favorable view of the Vermont senator, while just 11% hold an unfavorable view. In May, 45% had a favorable view and 11% held an unfavorable one.

And the Vermont Senator also holds a big edge over Clinton as the most empathetic candidate in the field; 45% say he's the one who cares the most about people like you, compared with 24% who pick Clinton on that score.

Clinton's advantages are apparent in voters' preferences on the issues, however. She is more trusted to handle two of the top domestic issues in the race: The economy (37%, compared with 28% who prefer Sanders' approach) and health care (43% Clinton to 27% Sanders).

And the former secretary of state's advantages are larger on matters of foreign affairs. She holds a wide lead as the more trusted candidate to handle both international trade policy (55% say they trust Clinton compared with Sanders' 14%; Biden is at 11% on that one) and terrorism (45% Clinton to 12% Biden and 11% Sanders).

But when it comes to dealing with "big banks and corporations," things are much tighter: 36% trust Sanders compared to 31% who favor Clinton.

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Poll: Hillary Clinton's lead over Democrats dwindling ...