Looking ahead to 2020, one question is uppermost in the minds of Democrats: Who can beat Donald Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE? A recent Gallup poll found that 58 percent of Democrats prioritize vanquishing Trump when making their primary decisions; only 39 percent say issues matter most. Former Vice President 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 calls the forthcoming contest a “battle for the soul of this nation.”

This dynamic has powered Biden’s candidacy. Polls show him to be the most competitive Democrat versus Trump. As Biden’s wife, Jill, recently told primary voters: “I know that not all of you are committed to my husband. . .but I want you to think about your candidate, his or her electability, and who’s going to win this race.” Forty-nine percent of Democrats say Biden has the best chance to defeat Trump; just 12 percent and 6 percent respectively give the nod to 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 and 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

Although Democrats prioritize winning, it may matter more to Republicans who beats Trump and what that would mean. The Democratic race is quickly becoming a three-person contest among Biden, Warren, and Sanders. Others may emerge, but the passage of time makes this extremely unlikely. The three contenders have different strengths. Biden stresses electability; Warren and Sanders say the next president should pursue major structural changes.

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These messages resonate with different audiences. Warren and Sanders have significant leads among young voters and those who label themselves either very liberal or liberal. Biden has large advantages among voters aged sixty-five and older and among African-Americans.

Donald Trump’s profound political weakness makes the 2020 Democratic nomination especially valuable. Today, only 29 percent say they will definitely vote to reelect Trump; 41 percent definitely will not do so.

Who becomes president matters. As Alexander Hamilton once said, “Every vital question of state will be merged into the question, ‘Who will be the next President?’”

For Republicans, Hamilton’s query has particular relevance. If it’s a President Warren or a President Sanders, GOP opposition will quickly coalesce. Trump has been quick to brand both as socialists, saying: “Here in the United States, we are alarmed by the new calls to adopt socialism in our country.”

Moreover, he has trademarked Representatives Alexander Ocasio-Cortez (D-Mass.) , Ayanna Pressley Ayanna PressleyEnding the Hyde Amendment is no longer on the backburner Fauci, Black Lives Matter founders included on Time's 100 Most Influential People list Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE (D-N.Y.) Ilhan Omar Ilhan OmarOmar urges Democrats to focus on nonvoters over 'disaffected Trump voters' Omar fires back at Trump over rally remarks: 'This is my country' Trump attacks Omar for criticizing US: 'How did you do where you came from?' MORE (D-Minn.) and Rashida Tlaib Rashida Harbi TlaibTrump attacks Omar for criticizing US: 'How did you do where you came from?' George Conway: 'Trump is like a practical joke that got out of hand' Pelosi endorses Kennedy in Massachusetts Senate primary challenge MORE (D-Mich.) as symbols of today’s leftward-leaning Democratic Party, tweeting: “The Democrats were trying to distance themselves from the four ‘progressives,’ but now they are forced to embrace them. That means they are endorsing Socialism, hate of Israel, and the USA! Not good for Democrats!”

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National surveys show a relatively close race. Biden beats Trump by 7 points; Sanders, 5; and Warren and Trump are tied. But an inside look at the polling shows Sanders and Warren doing less well than Biden among independents, Midwesterners and non-college educated voters. Sanders beats Trump by 8 points among independents; Midwesterners, +2 points; and noncollege educated, +1 point. Warren does worse: independents, +1 point; Midwesterners, -3 points; noncollege educated, -8 points. Biden fares far better: independents, +8-points; Midwesterners, +5 points; and noncollege educated, + 3-points.

Each of these constituencies was crucial to Trump’s 2016 win. He beat Hillary Clinton Hillary Diane Rodham ClintonBloomberg rolls out M ad buy to boost Biden in Florida Hillicon Valley: Productivity, fatigue, cybersecurity emerge as top concerns amid pandemic | Facebook critics launch alternative oversight board | Google to temporarily bar election ads after polls close Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE by 5 points among noncollege educated voters; 4 points among independents; and won the crucial Midwestern states of Pennsylvania, Michigan, Wisconsin, Ohio and Iowa.

The smaller Warren and Sanders margins among these crucial voters point to a razor close finish. Such a result would cause Republicans to see it as a rejection of Trump, not the party’s conservative policies. Unlike 2012, there would be no intraparty reflection. Instead, Republicans would denounce either Sanders or Warren as modern-day socialists.

But a Biden win – thanks to those crucial independents, Midwesterners and noncollege voters – is unlikely to produce immediate Republican opposition. Biden has never been tagged as a socialist, and his moderation is in line with another popular Democrat: Barack Obama Barack Hussein ObamaDemocrats ramp up pressure on Lieberman to drop out of Georgia Senate race The Hill's Campaign Report: Biden on Trump: 'He'll leave' l GOP laywers brush off Trump's election remarks l Obama's endorsements Trump pledges to make Juneteenth a federal holiday, designate KKK a terrorist group in pitch to Black voters MORE. Under a Biden presidency, Republicans would be more likely to undergo a period of self-examination. Moderate Republicans could find their hitherto silent voices, and Donald Trump would fade even more quickly into oblivion.

John Kenneth White is a professor of politics at The Catholic University of America. His latest book is titled “What Happened to the Republican Party?”