Is the Trump campaign going to make a political ad showing several times when 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 lost his train of thought?

Bet on it.

Will they make Biden’s son, Hunter, into a China-loving villain?

Yes.

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Most of all, you can count 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 to continue saying “The Bernie people” should “come to the Republican Party.” Trump tweeted that message earlier this month.

Trump is targeting the 27 percent of Democrats who told a HuffPost/YouGov poll last week they are “dissatisfied” or “upset” with Biden as the party’s presidential nominee.

Much of that discontent comes from 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.) supporters. Fifteen percent told an ABC/Washington Post poll in March “they’d back Trump over Biden.”

Like soldiers hiding in the hills, shooting at shadows long after the war is over, these dissident Democrats are mostly a threat to themselves.

Last week, Sanders and the other leading light of the party’s left wing, Sen. 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 (D-Mass.), gave strong endorsements to Biden. So did the most progressive president in my lifetime, President Obama.

They don’t want the nightmare of four more years of Trump assaulting healthcare in general and ObamaCare in particular; provoking racial tensions by ignoring the rise of white supremacist groups; demonizing immigrants; and showing indifference to climate change.

But somehow there are still leading voices on the left who say that it will be “four years of darkness” for progressives seeking structural change in America no matter who wins between Biden and Trump.

Say what?

Never forget that the two most progressive Supreme Court Justices, Ruth Bader Ginsburg Ruth Bader GinsburgPelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare House passes bill to avert shutdown Democrats urge Biden to resist filibuster, court-packing calls MORE and Stephen BreyerStephen BreyerREAD: Supreme Court justices mourn death of Ginsburg, 'an American hero' Ginsburg death sets up battle over future of court Trump's Supreme Court list reveals influence of Clarence Thomas MORE, are 87 and 81, respectively.

Ginsburg has had four bouts with cancer, including undergoing treatment for pancreatic cancer last year.

The dissident Democrats might want to ask themselves if they are willing to give Trump two more appointments to the Supreme Court.

If Trump makes those nominations, he will create a 7-2 conservative majority on the Court for another generation. That conservative majority will aim to end legal protection for abortion by overturning Roe v. Wade as well as reversing the legalization of gay marriage.

Trump has already appointed nearly 200 right-wing judges to the federal bench.

Last week, he threatened to forcibly adjourn Congress so that he could ram through a new slate of far-right presidential appointees.

When he endorsed Biden last week, Sanders said any of his supporters who cite policy disagreements with Biden as a reason to vote Republican or sit out this election are being “irresponsible.”

But not everyone sees it that way.

Briahna Joy Gray, Sanders’ former press secretary, last weeek tweeted about her admiration for “ideas like #MedicareForAll, cancelling ALL student debt, & a wealth tax.”

She immediately added that “Biden supports none of those,” to explain why she is not getting on board with Biden.

But in Sanders’ words, anyone who decides to stay on the sidelines will be guilty of allowing “the most dangerous president in modern American history to get reelected.”

Obama is also trying to rein in discontent among the Bernie Bros.

“Of course, Democrats may not always agree on every detail of the best way to bring about …[progressive] changes, but we do agree that they’re needed,” Obama said. “And that only happens if we win this election.”

Obama also took responsibility for some of the bitterness among Democrats on the left. He knows some on the left view his presidency as having been too moderate. They blame him for failing to blast Republicans who blocked his nominees and refused to act on his agenda.

If he was running for the White House this year, Obama said, he would be more aggressive and not run on the same platform as he did in 2008.

“The world is different,” he said during his 12-minute video endorsing Biden. “There is too much unfinished business for us to just look backwards. We have to look to the future.”

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Obama’s pitch fits with the fact that two-thirds of Democrats are “satisfied” with Biden as the party’s nominee, according to the HuffPost/YouGov poll.

It is also a fact that Biden won the majority of votes in the Democratic primaries. He won despite Sanders raising the most money. He won after losing the first three contests for the nomination. He won while being attacked by Trump, and without a big establishment campaign organization.

And now, Biden is attempting to build a bridge to Sanders voters.

Biden last week announced support for lowering the Medicare eligibility age from 65 to 60. He has also come around to making public colleges and universities cost-free for most students. These are both ideas from the Sanders playbook.

As Obama was fond of saying, let’s not let the perfect be the enemy of the good.

One of the most memorable moments at the 2016 Democratic National Convention featured comic Sarah Silverman, a Sanders supporter. She went on stage to say it made no political sense for people like her to abandon the Democratic ticket because Sanders lost the nomination.

“To the ‘Bernie or Bust’ people,” she said, “you’re being ridiculous.”

Here we go again. Bernie or Bust people, stop being ridiculous. Again.

Juan Williams is an author, and a political analyst for Fox News Channel.