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

A senior adviser to Sen. Bernie SandersBernie SandersProgressives soaring after big primary night 'Absolutely incredible': Ocasio-Cortez congratulates Cori Bush on upset victory over Lacy Clay Sanders supporters launch six-figure ad campaign explaining why they're voting for Biden 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 BidenGOP chairmen hit back at accusation they are spreading disinformation with Biden probe Trump outraises Biden in July, surpasses billion for the cycle Duckworth: Republican coronavirus package would 'gut' Americans With Disabilities Act MORE and Sen. Elizabeth WarrenElizabeth WarrenBill from Warren, Gillibrand and Waters would make Fed fight economic racial inequalities The other reason Democrats want Biden to shun debates The Memo: Biden faces balancing act 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 HarrisTwitter bans Trump campaign until it deletes tweet with COVID-19 misinformation Virginia mayor refuses to resign over controversial Biden, 'Aunt Jemima' post Exclusive: Democrats seek to increase racial diversity of pandemic relief oversight board MORE (D-Calif.) followed with 13 percent support, and South Bend, Ind. Mayor Pete ButtigiegPete ButtigiegCNN's Ana Navarro to host Biden roundtable on making 'Trump a one-term president' Former Indiana Gov. Joe Kernan dies How Republicans can embrace environmentalism and win 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