The most competition for black voters’ support in recent memory is set to take place among the candidates vying for the Democratic Party’s nomination to take on President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE.

African-American voters for years have been a key constituency in the Democratic race, helping to assure former President Obama’s and former Secretary of State Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE’s nominations in 2008 and 2016, respectively.

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But the fight this year promises to be even more frenetic given the number of top-tier candidates in the race and the fact that a clear front-runner has yet to emerge.

Sens. Kamala Harris Kamala HarrisButtigieg stands in as Pence for Harris's debate practice First presidential debate to cover coronavirus, Supreme Court Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (Calif.), Elizabeth Warren Elizabeth WarrenHarris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda Judd Gregg: The Kamala threat — the Californiaization of America GOP set to release controversial Biden report MORE (Mass.) and former Housing and Urban Development Secretary Julián Castro have all backed reparations to compensate African-Americans for slavery, a big shift that points to a leftward tilt in this year’s race and the importance of winning over black voters.

Obama, the first African-American president, never endorsed the idea of reparations. Neither did Clinton or Sen. Bernie Sanders Bernie SandersButtigieg stands in as Pence for Harris's debate practice Bernie Sanders warns of 'nightmare scenario' if Trump refuses election results Harris joins women's voter mobilization event also featuring Pelosi, Gloria Steinem, Jane Fonda MORE (I-Vt.) in the 2016 race. Sanders hasn’t backed reparations this cycle either.

Candidates are also highlighting the importance of black voters in other ways.

Harris, the daughter of a Jamaican father and an Indian mother, both of whom immigrated to the United States, launched her campaign on Martin Luther King Jr. Day.

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Sen.(N.J.), the other black candidate in the race, has openly talked about his parents’ struggle with housing discrimination in the 1960s and has confronted the “blackface issue” head-on as recent scandals have surfaced in Virginia.

“It’s 100 percent going to be a fight,” Anton J. Gunn, a Democratic strategist who worked in the Obama administration, said of the battle for the black vote. “It’s all about which of these candidates can recapture the Obama coalition.”

White candidates are also making inroads with black voters.

Warren regularly discusses issues of racial inequality in her campaign pitches, saying that African-American families faced an uphill climb “made even harder by the impact of generations of discrimination.”

So does Sanders, who emphasizes helping all low-income communities while noting they are disproportionately black.

Sanders appointed former Ohio state Sen. Nina Turner, who is black, as one of his campaign co-chairs. He also called Trump a racist during a speech in South Carolina on Martin Luther King Jr. Day.

One reason for the push is the South Carolina primary, which Harris and Booker are both making central to their campaigns.

While Iowa and New Hampshire, the first two contests in the Democratic primary, are overwhelmingly white states, South Carolina has a large African-American population.

Given the size of the Democratic field and some feelings within the Democratic Party that it should field a minority candidate, its importance feels especially large this cycle.

Harris has already taken a couple of trips to the state, tapping into her network at Alpha Kappa Alpha, the nation’s largest black sorority. And Booker has sought to be competitive there by making some key hires in the state.

Both candidates will face strong competition from former Vice President Joe Biden Joe BidenOmar fires back at Trump over rally remarks: 'This is my country' Trump mocks Biden appearance, mask use ahead of first debate Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE, who is expected to enter the race and has long ties to supporters in the Palmetto State. He is also someone with strong backing from the black community after serving with Obama for eight years.

Pollster Celinda Lake pointed out that Biden has an 80 percent favorability among Democratic primary voters surveyed in South Carolina. A poll out last week by Change Research also showed that Biden — a favorite among civil rights activists — beats out other Democratic candidates in the state. Of 600 likely Democrats polled, Biden received 36 percent support. Sanders followed with 14 percent of the vote, while Harris received 13 percent.

“He has a lot of existing support,” Lake said. “And it’s a constituency he hasn’t taken for granted.”

A key factor, says Cornell Belcher, a prominent pollster who worked on Obama’s campaigns, will be candidates’ authenticity.

“Each candidate has to craft their own message that is credible to their brands,” Belcher said. “What’s right for Elizabeth Warren may not necessarily be right for Kamala Harris.”

Differences among the candidates on some of the issues touching on race — notably reparations — are already coming to the fore.

Booker is pushing “baby bonds,” which would give every child born in the United States a savings account. The government would add money to the account each year, with low-income children getting more money. Asked about reparations, Booker’s office highlighted the plan, which is not explicitly built to deal with racial disparities.

Sanders in 2015 said in an interview with Fusion that he opposed reparations because the possibility of getting legislation through Congress was highly unlikely and because it would be very divisive.

“I think the real issue is when we look at the poverty rate of the African-American community, when we look at the high unemployment rate within the African-American community, the high incarceration rate within the African-American community, we have a lot of work to do,” Sanders said. “So, I think what we should be talking about is making massive investments in rebuilding our cities, in creating millions of decent paying jobs, in making public colleges and universities tuition free and working on child care.”

Warren is backing reparations not only for black people but for Native Americans as well.