Sen. Bernie Sanders Bernie SandersKenosha will be a good bellwether in 2020 Biden's fiscal program: What is the likely market impact? McConnell accuses Democrats of sowing division by 'downplaying progress' on election security MORE (I-Vt.) is looking to turn the Democratic primary race into a one-on-one battle with former Vice President Joe Biden Joe BidenSenate Republicans face tough decision on replacing Ginsburg What Senate Republicans have said about election-year Supreme Court vacancies Biden says Ginsburg successor should be picked by candidate who wins on Nov. 3 MORE.

New national and early-state polls suggest the two candidates are getting some separation from the rest of the pack, and those polls have coincided with new, pointed attacks from the Sanders campaign on Biden.

Team Sanders has accused Biden of supporting cuts to Social Security and is questioning his record on race as they seek to cut into his strength with African Americans and older voters.

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The Biden campaign is swinging back, releasing new ads accusing Sanders of mischaracterizing his record and making the case that Biden is best positioned to win a head-to-head match-up against President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE.



The volleys come at a pivotal moment, with Sanders growing stronger in polls and challenging Biden’s long-standing lead in national surveys.

A national CNN poll released Wednesday found Sanders at 27 percent support and Biden at 24 percent, marking the first time the poll has found anyone but Biden alone at the top. Sen. Elizabeth Warren Elizabeth WarrenBiden's fiscal program: What is the likely market impact? Warren, Schumer introduce plan for next president to cancel ,000 in student debt The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon MORE (D-Mass.) is running a distant third with 14 percent.



A Biden confidant said the campaign sees Sanders as its biggest rival at the moment, even as polls of Iowa and New Hampshire find a tighter four-candidate race between Biden, Sanders, Warren and former South Bend, Ind., Mayor Pete Buttigieg Pete ButtigiegBipartisan praise pours in after Ginsburg's death Bogeymen of the far left deserve a place in any Biden administration Overnight Defense: Woodward book causes new firestorm | Book says Trump lashed out at generals, told Woodward about secret weapons system | US withdrawing thousands of troops from Iraq MORE.



“For now at least it's trending that way,” said the Biden insider. “It looks like Warren and Pete have peaked."



After struggling to reach people of color in the 2016 Democratic primary, Sanders has markedly improved his standing among nonwhite voters and is now challenging Biden at the top.



Sanders has built a diverse coalition of high-profile advocates, featuring artists, such as Killer Mike, and lawmakers, such as Reps. Alexandria Ocasio-Cortez Alexandria Ocasio-CortezLawmakers fear voter backlash over failure to reach COVID-19 relief deal Why Democrats must confront extreme left wing incitement to violence The Hill Interview: Jerry Brown on climate disasters, COVID-19 and Biden's 'Rooseveltian moment' MORE (D-N.Y.), Ilhan Omar Ilhan OmarDemocrats scramble on COVID-19 relief amid division, Trump surprise Larry Kudlow defends response to coronavirus: Trump 'led wisely' The Hill's Morning Report - Sponsored by National Industries for the Blind - Woodward book revelations rock Washington MORE (D-Minn.), Pramila Jayapal Pramila JayapalDHS opens probe into allegations at Georgia ICE facility Progressive Caucus co-chair: Whistleblower complaint raises questions about 'entire detention system' Buttigieg, former officials added to Biden's transition team MORE (D-Wash.) and Rashida Tlaib Rashida Harbi TlaibGeorge Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge The Democratic Party platform represents our big tent MORE (D-Mich.).

The Sanders campaign has invested heavily in Latino and African American outreach, recognizing it as his most glaring deficiency from 2016.



That effort appears to be paying off. The CNN survey found Sanders winning 30 percent support among nonwhite voters, compared to 27 percent for Biden.

They are also attacking Biden directly.



Sanders’s national campaign co-chairwoman Nina Turner wrote an op-ed last week in South Carolina’s “The State” that Biden “has repeatedly betrayed black voters to side with Republican lawmakers and undermine our progress.”

So far, Biden is retaining his lead.

Most polls of South Carolina find Biden leading by more than 20 points. The Palmetto State is widely viewed as Biden’s firewall due to his popularity among black voters, who make up more than half of the primary electorate in the state.



The Biden campaign released a statement on Wednesday promoting his strength among black voters and pointing out that 15 members of the Congressional Black Caucus have endorsed him — more than every other candidate in the field combined.



In recent days, Biden has won endorsements from influential black Democrats, including Reps. Frederica Wilson Frederica Patricia WilsonHarris calls it 'outrageous' Trump downplayed coronavirus House passes bill establishing commission to study racial disparities affecting Black men, boys Florida county official apologizes for social media post invoking Hitler MORE (D-Fla.), Alcee Hastings Alcee (Judge) Lamar HastingsFlorida Democrat introduces bill to recognize Puerto Rico statehood referendum Poisoning of Putin opponent could test US-Moscow relationship Florida county official apologizes for social media post invoking Hitler MORE (D-Fla.), Sanford Bishop (D-Ga.) and Donald Payne Jr. (D-N.J.).



The fight for older voters is just as pitched.



The Sanders campaign and left-wing media have been digging up Biden’s decades-old remarks about addressing federal spending through freezes on entitlement programs.



The Biden campaign responded with an online ad accusing the Sanders campaign of unleashing a “barrage” of “dishonest” attacks against Biden.



“Biden’s plan protects Social Security and will increase benefits,” the ad states. “Bernie’s negative attacks won’t change the truth — Joe Biden is still the strongest Democrat to beat Donald Trump.”

Sanders countered with his own ad featuring interview footage of Biden recounting his repeated attempts to “freeze” spending on Social Security, Medicare and Medicaid. The ad is approaching 1 million views on YouTube.



“We’ve got some bad news for them,” Sanders says in the ad. “We are not going to cut Social Security, we’re going to expand benefits.”



Sanders’s Social Security attacks are designed to reach the older voters who are currently in Biden’s camp.



The CNN national survey found Biden leading Sanders by a margin of 37 percent to 8 percent among people aged 65 and older.



The back-and-forth appeared to get under Biden’s skin on Wednesday, after a reporter for CBS News confronted him about why he had released an attack ad against Sanders, who had earlier apologized for a surrogate calling Biden "corrupt."



“Why, why, why, why, why, why, why,” Biden shot back. “You’re getting nervous man. Calm down, it’s OK. He apologized for saying I was corrupt. He didn’t say anything about whether or not I was telling the truth about Social Security.”



The Biden confidant said they’re not sweating the attacks on Social Security, believing that a policy fight between the two will play out in Biden’s favor.



“It's a matter of making the case that our plans are more realistic,” the source said. “Bernie can say all he wants about Social Security. The fact of the matter is, Joe Biden's plans are the ones based in reality.”



The worry, the confidant acknowledged, is that the 2020 primary race could emulate the 2016 race, which was defined by a brutal slugfest between centrist Democrats and the ascendant left wing of the party that is advocating for radical change.



“We've seen this before. We could fall into the same trap this time,” the source said. “I don't think Bernie himself will get aggressive. But his supporters and surrogates are out to burn down the barn.”



Sanders personally apologized to Biden this week after a surrogate ran an op-ed warning that Biden “has a big corruption problem and it makes him a weak candidate.”



“To avoid the same 2016 tumult, the onus will be on Sanders to tamp down the rhetoric and sentiment among his supporters about policy purity tests,” said Democratic strategist Basil Smikle.



The other worry in the Biden camp, according to one longtime Democratic donor, is that while Biden is arguing that he’s the most electable against Trump, the Sanders campaign has more grassroots energy and excitement.



Sanders has been warning on the campaign trail that the party must not nominate someone who does not energize the liberal base.



“The problem is, I like the guy. [Biden] has a lot of soul and compassion, but he's not that good of a candidate,” the donor said.



Democrats say the Biden-Sanders fight is a preview of the coming showdown between the left and the center, as both sides press their case in the stretch run to the caucuses.



“Are Democratic voters looking for steady and safe or are they looking to completely turn the system upside down?” asked Democratic strategist Andrew Feldman. “That’s the central question and we just have no idea at this point.”