Former secretary of state Hillary Clinton meets with voters during a rally in Portsmouth, N.H., on Saturday. (Melina Mara/The Washington Post)

MANCHESTER, N.H. – Sen. Bernie Sanders (I-Vt.) retains a double-digit lead over Hillary Clinton in a state poll released Sunday, but Clinton has begun to narrow his lead.

The CNN/WMUR poll showed about a third of New Hampshire Democrats saying they haven’t made a final choice two days before the nation’s first primary vote on Tuesday.

Sanders leads 58 percent to 35 percent in the survey of likely Democratic voters conducted by the University of New Hampshire, and he beats her in nearly every demographic.

Hillary Clinton's New Hampshire campaigners are making a ground-game push, hoping to keep Clinton within striking distance of heavily favored Bernie Sanders in the final days before the Democratic primary there. (Dalton Bennett/The Washington Post)

The only silver lining for Clinton may be that just 61 percent of voters said they had made a definite choice, with the rest at least somewhat open to persuasion. Sanders leads Clinton 63 percent to 37 percent among those who said they have made a final choice.

Men preferred Sanders by a large margin of 70 percent to 27 percent, and the senator bests Clinton among women 49 percent to 41 percent.

Sanders’s strongest support came from voters under 35, with 85 percent of them saying they support the independent senator, while Clinton was the choice of 51 percent of voters over 65.

The same survey showed Clinton with 32 percent support overall among Democrats and Sanders with 61 percent. Although Clinton allies chalk much of Sanders's support here to his next-door neighbor status, but the CNN/WMUR poll shows that Sanders was hardly a favorite when he entered the race. In July, shortly after he entered the race, he captured 5 percent of support here to Clinton's 59 percent.

The survey of 406 randomly selected New Hampshire Democrats took place Wednesday to Saturday and has a margin of error of plus or minus 4.9 percentage points.

The average of recent polls compiled by Real Clear Politics gives Sanders a 15.2 point advantage.

Teacher and writer Andrea Ardito of Portsmouth, N.H., came to Exeter on Friday with her children to support Bernie Sanders in the final days before the primary there. (Dalton Bennett/The Washington Post)