Jonathan V. Last, editor of The Bulwark, a site founded by Never Trump Republicans, explains how he sees the new situation, the withdrawal of Joe Biden and the ascension of Kamala Harris as the likely nominee:

The Democratic party is healthy. The Republican party is not.

Our greatest living president. (Jessica Rinaldi/The Boston Globe via Getty Images)

1. Seven Lessons

(1) The Democratic party is a healthy institution.

On the night of June 27, the various power centers within the Democratic party began a difficult conversation: Was Joe Biden still capable of running a vigorous campaign?

Over three weeks the party reached a diffuse—if not unanimous—consensus: He was not. This consensus was the product of all levels of the party: Elder statesmen such as Nancy Pelosi, elected Democrats analyzing their own future prospects, donors making decisions about spending, and the main body of public opinion among Democratic voters.

Once this consensus was reached, the various power centers began a dialogue with the party’s leader, President Biden. The party expressed its choice. Biden pushed back. The party took up the question again and, after due consideration, held firm.

Joe Biden then stepped aside for the good of the nation.

This is how healthy institutions are supposed to work…

2. The process which elevated Kamala Harris was sensible.

The Democratic party made another institutional decision in parallel with the Biden question: It vetted Kamala Harris.

This subroutine executed in the background, but it was active. Democratic voters began to consider her as the nominee and polling showed that they were comfortable with her. Party elders evaluated her fitness. Donors and elected Democrats took her measure. The fact that no anti-Harris groundswell—or even boomlet—emerged is proof that the party decided that Harris was an acceptable nominee.

After Biden blessed Harris on Sunday afternoon, the party coalesced around her in much the way it did Biden after the New Hampshire primary in 2020.

The Democratic party will enter the election more unified than it had been pre-debate.

3. Kamala Harris can run as an insurgent, but with the advantages of an incumbent.

The largest advantage of incumbency is that a candidate does not have to take base-pleasing positions during a primary campaign that can hurt him during a general election.

Because of the extraordinary nature of her ascendence, Harris possesses this advantage. She will carry nearly every advantage of incumbency and yet she can credibly position herself as this election’s change agent.

4. Trump is holding the age bomb.

The Trump campaign spent two years creating a political bomb concerning old age. They assumed that they could plant this bomb at the feet of Joe Biden.

Trump is now the one holding the age bomb. He is not only a full generation older than Harris—everything about him looks geriatric by comparison. From his gait to his bronzed-over pallor; from the way he rambles and gets lost in sentences to his inability to keep facts straight.

Every split screen now makes Trump look old and decrepit by comparison. 

5. There was enormous pent-up demand among Democrats for a younger leader.

In the first 24 hours, Kamala Harris raised over $100 million from small-dollar donors.

Sit with that for a moment. $100 million.

That’s more money than any Democrat has ever raised in a single day. It’s twice as much as Trump raised following his felony conviction. If this doesn’t snap your head back, it should.

Because it’s as good a proxy as you’ll find for excitement.

It will be several days until we have polling with a more detailed view of Harris’s support from Democratic voters, but it is already clear that she will perform much better than Biden has within her party.

Here’s my advice: You should be open to the idea that Harris could ride a wave of excitement and passion that absolutely no one was seeing until Biden stepped aside. I’m talking Obama ‘08-levels of energy.

It’s not a given. But it’s in the realm of the possible. Keep your eyes peeled for it.

6. The Republican party is a failed state.

At the debate, Donald Trump also demonstrated (again) that he is unfit for office. He rambled and lied incoherently. He is a convicted felon. A jury found him guilty of sexual assault. He has said he wants to be a “dictator” and that he wants to “terminate” parts of the Constitution. He selected as his running mate a man who advised disobeying orders from the Supreme Court and forcing a constitutional crisis.

Until last week there was nothing stopping the Republican party from forcing Trump off the ticket. The party elders and elected officials could have demanded that Trump step aside. Republican voters could have said that they had no confidence in his ability to govern. Donors could have closed their wallets.

But the plain fact is that not one single Republican called on Trump to step aside.

Not one.

Why? Because the various precincts of the Republican party understand that they hold no power—at all—over Trump. They could not ask him to withdraw from the race. Even broaching the subject would be grounds for excommunication from the party.

The Democratic party is a functioning institution, with checks and balances; constituencies and power structures. Like any institution, it is amorphous and its decision making is mostly organic.

The Republican party is an autocracy where the only thing that matters is the will of the leader. All power flows through him. All decisions are made by him. There are no competing power centers—only vassal states overseen by his noblemen.

7. Harris is an underdog.

One of the reasons the last three weeks have been so difficult is because Democrats were not choosing between a “good” outcome and a “bad” outcome. 

Those sorts of choices are easy.

Instead, Democrats were tasked with deciding between least-bad options. Humans rebel against the idea of “least-bad.” When faced with choices, we want to believe that at least one of them is “good.”

When the first real Harris-vs.-Trump polling comes out next week we’ll see how big of a hole she’s in. But unlike Biden, Harris has the ability to spend the next three months on offense, all day, every day. If she can deliver the goods, she has a puncher’s chance.

2. In Praise of Biden

A slight push-back against those who believe Biden took too long to step aside:

It was three and a half weeks from the debate to Biden pulling out. That’s it.

Joe Biden is the president, but he’s also just a man. Coming to a decision like this one—an unprecedented decision—is hard. There’s a lot to weigh and there’s a tremendous responsibility to get it right.

My own view is that Biden made the call basically as quickly as possible. He couldn’t have done it the week of the NATO summit. Then Trump was shot in the ear. Then there was the Republican convention. To my mind, Biden’s timing on this was optimal, actually.

Nothing about Joe Biden’s presidency was inevitable. Not his candidacy. Not his victory over Trump. Not his withdrawal from reelection.

At nearly every turn, Biden did the right thing for America.

His legacy is assured. He will be remembered as one of the great modern presidents.

I said this last night and I’ll say it again. History had its eye on Joe Biden, and he met the moment. He did his part. Now it’s up to Kamala Harris and us to do ours.

This is the moment. Live it with us.