Top adviser on Sanders: 'He's always been underestimated'

A senior adviser to Sen. Bernie SandersBernie Sanders2020 Dems slam Trump decision on West Bank settlements Sanders doubles down on Bolivia 'coup,' few follow suit Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE’s 2020 presidential campaign said during an interview aired on Wednesday that the Vermont independent has “always been underestimated.”

“He is very, very focused — his work is his life,” Jeff Weaver told Hill.TV, referring to Sanders. “There is nothing else other than his kids and his grandkids, there is nothing else.”

“He has a mission which is to help working people in marginalized communities and that’s what he’s worked on his whole life,” he added.

Weaver’s comments come after recent polling suggesting that Sanders could be underestimated in the crowded Democratic field.

Most national polls show Sanders consistently polling among the race’s top tier candidates along with former Vice President Joe BidenJoe Biden2020 Dems slam Trump decision on West Bank settlements Trump calls latest impeachment hearings 'a great day for Republicans' Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE and Sen. Elizabeth WarrenElizabeth Ann Warren2020 Dems slam Trump decision on West Bank settlements Sanders doubles down on Bolivia 'coup,' few follow suit Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul MORE (D-Mass.).

Even though Biden has maintained his lead as the clear frontrunner, some polls suggest that Sanders, who also boasts a strong grass-roots fundraising base, could be gaining some ground in key battleground states like Colorado.

According to an Emerson poll released on Tuesday, Sanders tops the field with 26 support among likely Democratic primary voters in Colorado, with Biden trailing at 25 percent.

Warren came in a close third, receiving 20 percent support in the survey. Sen. Kamala HarrisKamala Devi HarrisKamala Harris endorses Christy Smith in bid to fill Katie Hill's seat Poll: Biden holds 11-point lead over Warren in Arizona Poll: Biden and Warren are neck and neck in California MORE (D-Calif.) followed with 13 percent support, and South Bend, Ind. Mayor Pete ButtigiegPeter (Pete) Paul Buttigieg2020 Dems slam Trump decision on West Bank settlements Overnight Health Care: GOP senator says drug price action unlikely this year | House panel weighs ban on flavored e-cigs | New York sues Juul Buttigieg surges to 10-point lead in New Hampshire: poll MORE rounded out the top five candidates with 5 percent support.

However, polls remain volatile and have also shown Sanders slipping in other key swing states like Iowa.

A Monmouth University released earlier this month showed Sanders dropping into fourth place in the Hawkeye State behind Warren and Biden.

Several candidates, including Sanders, have sought to highlight their incremental gains or question surveys that show them losing support.

Pollsters and experts, meanwhile, have cautioned against reading too much into primary polls.

“It’s August of 2019, the horse race polls are absolutely worthless,” Democratic pollster Chris Kofinis told The Hill. 

—Tess Bonn