Last week’s Democratic debate in Atlanta was a showcase for diversity, beginning with the fact there were four female moderators. On stage, the candidates ranged in age from 37 to 78. There were two African American senators, an Asian American congresswoman, and a gay midwestern mayor. There was a former vice president with a lifetime of public service, along with two wealthy entrepreneurs with no government experience. Whether a Minnesota moderate or a Democratic Socialist, almost every American could see themselves reflected in the group onstage.

Almost. Julián Castro — the sole Latino in the 2020 race — was conspicuous in his absence.

That was a loss to viewers and voters, as Castro brings an important perspective to the presidential contest. He has consistently elevated the concerns of Latinos, people of color, and marginalized groups. He has been a strong progressive voice in past debates. As long as his campaign can marshal funds and resources, Castro should remain in the race.

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In theory, Castro should have been a much more competitive candidate. He is a graduate of Harvard Law and Stanford, former mayor of San Antonio, and former Secretary of Housing and Urban Development. Like Joe Biden Joe BidenFormer Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick Bloomberg rolls out M ad buy to boost Biden in Florida MORE, he served in the Obama administration. Like Bernie Sanders Bernie SandersSirota reacts to report of harassment, doxing by Harris supporters Republicans not immune to the malady that hobbled Democrats The Hill's Morning Report - Sponsored by Facebook - Republicans lawmakers rebuke Trump on election MORE, he favors a single-payer health care system. Like Elizabeth Warren Elizabeth WarrenOvernight Defense: Appeals court revives House lawsuit against military funding for border wall | Dems push for limits on transferring military gear to police | Lawmakers ask for IG probe into Pentagon's use of COVID-19 funds On The Money: Half of states deplete funds for Trump's 0 unemployment expansion | EU appealing ruling in Apple tax case | House Democrats include more aid for airlines in coronavirus package Warren, Khanna request IG investigation into Pentagon's use of coronavirus funds MORE, he swore off PAC money and has released a series of detailed policy plans (he was the first candidate with an immigration plan). Plus, he seemed a potentially ideal foil to a president who has often demonized Latinos and immigrants.

However, Castro has struggled to gain traction with voters, typically registering only 1-2 percent support in national and regional polls. As a result, he did not meet the requirements to be onstage in Atlanta, and it is unlikely that he will clear the higher thresholds for the Dec. 19 debate in Los Angeles.

To Castro’s credit, in past debates he did not shy away from controversial topics. In the June debate, he helped spark discussions on decriminalizing unauthorized entries at the border, reproductive and transgender rights, reparations, and homelessness. In the October debate, he reminded the audience that “Police violence is also gun violence,” and said the names of victims of police shootings. Unlike other lower-tier candidates, a writer for Texas Monthly observed, Castro has stayed “relentlessly focused on issues ignored or downplayed by almost everyone else in the field.” As evidence that Castro’s presence on the stage mattered, consider that, in his absence, the subject of immigration was barely mentioned in the last debate.

Despite not being on stage in Atlanta, Castro still managed to stay relevant. His not being in the debate generated a wave of media coverage, including articles in publications like Esquire, Politico, and Rolling Stone. Latino and progressive groups lamented “Latino erasure” from the nomination process. On debate night, “#JuliánDebates” trended on Twitter, and his campaign had its most successful fundraising night of the month, beating what he raised in the previous two debates. Clearly, he has devoted supporters and followers who want him to keep going.

Castro’s candidacy has mattered to Latinos, who the Pew Center says are on track to be the largest group of nonwhite voters in 2020. He is living proof that a qualified Mexican-American can compete at the highest level of American politics. Still, he has never really been treated as a viable candidate by the mainstream media; they are too busy obsessing over “electability” as it pertains to white voters in the Midwest. Much of Castro’s initial coverage dwelled on the irrelevant question of whether he is fluent in Spanish. As an example of how silly this is, has anyone checked with Andrew Yang Andrew YangBiden's latest small business outreach is just ... awful Doctor who allegedly assaulted Evelyn Yang arrested on federal charges The Hill's Campaign Report: Biden weighs in on police shootings | Who's moderating the debates | Trump trails in post-convention polls MORE to see if he speaks Chinese?

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Sure, Castro’s jab at Biden in the September debate was probably not his best moment, and his campaign at this point is a long shot. But Castro’s campaign has been a long shot from the beginning. Now, each day that he stays in the race is a victory for vulnerable communities. His visibility is important, especially with hate crimes against Latinos on the rise and many Latinos feeling targeted.

On a pragmatic level, the longer Castro can remain a national figure, the better chance he will have at being in the running for vice president or a possible cabinet position. It also affords him standing to raise questions about the nomination process, like why Iowa and New Hampshire, both overwhelmingly white states, are accorded such immense electoral power in an increasingly diverse America.

There is value, power, and authenticity in Julián Castro’s candidacy, so he should continue his quest for the Democratic nomination. Winning is not always about finishing first — sometimes, it‘s about staying in the game.