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 went further this primary season than some might have imagined at the outset, but despite his significant accomplishments, his race to the White House is over. Democrats will head into November with Hillary Clinton Hillary Diane Rodham ClintonWhat Senate Republicans have said about election-year Supreme Court vacancies Bipartisan praise pours in after Ginsburg's death Trump carries on with rally, unaware of Ginsburg's death MORE as their standard-bearer to face off against Donald 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 (assuming he survives an attempted coup by his party’s establishment).

In short, there is no plausible route for Sanders to overcome the advantage Clinton enjoyed of 319 pledged delegates before Tuesday’s contests. Since the former first lady leads the pledged delegate race 58 percent to 42 percent, with roughly half of the delegates to take the nomination already allocated, Sanders would have to win nearly 60 percent of delegates in the remaining states just to tie her.

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That’s just not going to happen.

Clinton beat Sanders in the South on the strength of the region’s Democratic base: African-Americans. She beat him in Hispanic-heavy states like Nevada and Florida. She beat him in white-dominated industrial states like Ohio. In fact, she’s beaten him just about everywhere Democrats came out to vote in numbers — of the nine states the Vermont senator has won, five have been low-turnout, undemocratic caucuses. While Sanders has gotten an impressive 6.3 million votes this cycle, Clinton has far outpaced him, with 8.7 million votes.

Just like Howard Dean taught us 10 years ago, you can’t build a meaningful progressive campaign without the support of African-Americans, Hispanics and Asians.

Now, it’s true that the second half of the primary schedule looks far more favorable to Sanders than the first half was. Most of the South has already voted, diminishing the role of African-American voters in the months ahead. Caucuses in Idaho, Alaska, Hawaii, North Dakota, Wyoming and Washington should favor Sanders, as well as primaries in less diverse places like Oregon and Utah. But he would still need to perform exceedingly well in states like New York, New Jersey and Pennsylvania, winning them all by an average of 16 points. Anything less than that — anywhere — and his necessary victory margins down the line get that much larger.

In short, while there is still a mathematical path to victory for Sanders, it’s not a realistic one. Clinton never trailed Barack Obama Barack Hussein ObamaObama calls on Senate not to fill Ginsburg's vacancy until after election Senate Republicans face tough decision on replacing Ginsburg Cruz: Trump should nominate a Supreme Court justice next week MORE by anything more than around 150 delegates at any point during the 2008 primaries. And that race wasn’t particularly close.

So the Sanders campaign is left to make dangerous suppositions about its path to victory. “We acknowledge it’s a difficult route; we acknowledge it’s a substantial lead, but we do not believe it’s set in stone,” Sanders adviser Tad Devine said after Sanders’s 0-5 performance last Tuesday. “The factors superdelegates will take into consideration include who’s won more pledged delegates ... but also who’s gotten stronger, not weaker, over the course of primaries, and who matches up best against Donald Trump or whoever the Republican nominee is.”

In short, the Sanders campaign is now making the same argument it was decrying just a few months ago — that Democratic superdelegates should subvert the choice of the Democratic electorate to hand the nomination to the primary loser. It was an absurd argument when Clinton made it in 2008, and it’s no less absurd today. And if anyone was a beneficiary of such usurpation of the will of the voters, it certainly wouldn’t be an outsider like Sanders.

Sanders is obviously free to stay in the race so long as his supporters keep funding his efforts. But no one should get angry when the rest of the party starts focusing on the Trump threat.

Moulitsas is the founder and publisher of Daily Kos.