Hillary Clinton Dominating the Surrogate Game in New Hampshire As candidates hit the homestretch, fill-ins matter, organizers say.

MANCHESTER, NH -- Hillary Clinton seems to have a strategy for trying to chip away at Bernie Sanders’s lead in New Hampshire: Campaign every day, even when you’re out of the state.

Clinton sent a battalion of high-profile supporters to the Granite State this week, including her husband, former President Bill Clinton. Minnesota Sen. Al Franken arrived today, while television star Lena Dunham and U.S. soccer legend Abby Wambach will criss-cross the state Friday.

Despite winning New Hampshire eight years ago, Clinton has struggled against the popular senator from neighboring Vermont. Recent polls have varied; some show the two Democrats in a dead-heat, while another gives Sanders a 10-point lead.

Sanders, though, has not been able to match the mega-wattage of Clinton’s visitors. His most high-profile supporter in the state to date may be Ben Cohen, co-founder of Ben & Jerry’s ice cream, or Jesus “Chuy” Garcia, a popular progressive politician from Chicago, not exactly the same as having a former president on your side.

Less than five weeks until the primary, University of New Hampshire political science professor Dante Scala says winning “the surrogate game” matters.

“This time of year especially, the most scarce commodity available is the candidate’s time,” he told ABC News. “The next best thing is a surrogate.”

Surrogates are often asked to do the heavy lifting with particular constituencies and demographics. While few people have heard of state Sen.r Jeff Woodburn outside of northern New Hampshire, his support means Clinton, who's campaigning in Los Angeles today, has an active campaign in remote northern communities, where snow and ice routinely deter candidate visits.

“Abby Wambach, for example, is not a political figure,” Scala added, “but she clearly resonates with sports fans and young people. Clinton is having some difficulties with younger women voters, so it helps with particular demographics.”

Candidates’ families are also being asked to pitch in. Heidi Cruz landed in New Hampshire Wednesday to stump on behalf of her husband, Ted Cruz. The Texas senator hasn’t visited the state for weeks, but Cruz supporter Diane Bitter says a surrogate visit can give grassroots supporters a much-needed jolt of enthusiasm in the cold winter months.

“It’s invigorating to your supporters and your volunteers,” said Bitter, who runs the state's conservative 603 Alliance. “People are always very impressed [with Heidi]. They see her, and they think it reflects on her husband.”

But others, including the Sanders campaign, are downplaying the significance of substitute campaigners.

“The level of enthusiasm for Bernie and his message that we’re seeing in the Granite State is unlike any other campaign in either party,” said Karthik Ganapathy, Sanders’ New Hampshire communications director. “The amount of hours volunteers are putting in, the visceral enthusiasm we see at rallies, the canvassers going door to door ; that could make the crucial difference.”