The Minneapolis Democrat has denied the charges, and an investigation paid for by the state Democratic-Farmer-Labor Party could not corroborate the woman’s claims.

ADVERTISEMENT But the allegations have taken a toll, and the race between Ellison and former state Rep. Doug Wardlow (R) is neck and neck.

A poll conducted for the Minneapolis Star Tribune and Minnesota Public Radio last month showed Ellison leading Wardlow, 41 percent to 36 percent, even as Democratic candidates led their Republican rivals up and down the ballot in other contests.

The poll showed more voters, 31 percent, said they had an unfavorable impression of Ellison than those who said they had a favorable impression at 20 percent.

Voters and Democratic activists here say the allegations are weighing on the party’s prospects — and, in some cases, their own thoughts about the liberal firebrand whose star seemed to be on the rise.

“Unfortunately, it’s hurting him and Republicans are using it to bring down other Democrats,” said Roberta Humphries, a retiree who volunteers for Democratic candidates.

“Curiously, Tina Smith has chosen to believe Keith Ellison’s ‘categorical’ denials, affirming his support for him and openly campaigning with him,” Housley said in a statement. “It’s time to put an end to the hypocrisy and give Minnesotans the clarity they deserve.”

Smith has not mentioned Ellison in recent weeks. She is still listed as having endorsed his campaign on Ellison’s website.

Wardlow’s campaign is using the allegations in hopes of discrediting Ellison.

“Keith Ellison has been accused of domestic violence by multiple women. Even the National Organization for Women has called for Ellison to end his campaign,” the ad says.

Ellison’s campaign did not respond to a request for comment.

Ken Martin, the chairman of the state Democratic-Farmer-Labor Party, said he has not seen evidence in the party’s weekly polls that the allegations are dragging down other candidates.

But he said the allegations have made the race for attorney general much closer than it should be in a blue state and in a year in which Democrats benefit from a tailwind.

“It’s going to be a close race. It shouldn’t be a close race,” Martin said in an interview. “It’s a concern to me, it’s a concern to all of the Democrats who work in politics in this state.”

Martin said an additional investigation from state or local law enforcement “is necessary and prudent.”

The party’s handouts, which typically highlight their entire slate of candidates, now omit down-ballot contenders like Ellison, a hint that it wants to steer clear of the controversy.

Ellison, a rising star in the progressive wing of the Democratic Party who narrowly lost a race to chair the Democratic National Committee last year, made an unexpected jump into the race for a statewide office back home.

Ellison decided to run for attorney general after the incumbent, Lori Swanson (D), made a late entry into the race for governor.

Republicans believed they had little hope of beating Swanson, had she run for reelection.

Party strategists privately said they missed an opportunity to recruit a candidate stronger than Wardlow, who served a single term in the state House before losing reelection.

Some Democrats said the timing of the allegations just before the primary raised eyebrows.

“It’s a tragedy that this thing came out the way it did,” said Chuck Smith-Dewey, a Democratic activist who runs a health-care website. “We don’t know the truth of what happened, but I’m getting sick of this trial by news cycle.”

The Minnesota poll showed 21 percent of voters believe the claims of domestic violence, while 22 percent did not. Fifty-seven percent said they were unsure.

The allegations “really disappointed me because I liked” Ellison, said Liz Fleming, a retiree in Bloomington who does not count herself as a Democrat or a Republican. “That will affect how I vote.”

Democrats say they hope to make the race a binary choice between Ellison and Wardlow, whom they paint as an arch conservative.