Biden’s Gaza policy is a liability for Kamala Harris. She must break with Biden now | Mehdi Hasan

The sitting Democratic president is not running for re-election. His vice-president has inherited his campaign - and refuses to disown an unpopular foreign war. Robert Kennedy is running for president. The Republican candidate is a corrupt authoritarian. A Planet of the Apes movie is in theaters. And anti-war protesters are threatening to disrupt the Democratic convention in Chicago.

Now, I'm far from the first columnist to make this comparison. Plenty of pieces have been published on the uncanny and, yes, undeniable similarities between these two consequential election years. "History," as Mark Twain is said to have remarked, "does not repeat itself. But it rhymes."

Joe Biden, after all, is the first president to announce he is not running for re-election since Lyndon Johnson, 56 years ago. And just as Biden's replacement at the top of the Democratic ticket is his vice-president, Kamala Harris, so too was Johnson's.

Vice-President Hubert Humphrey had been a popular, well-respected senator from Minnesota and one of the architects of postwar American liberalism. He had served as a loyal deputy to Johnson over four years, even publicly defending a bloody quagmire in Vietnam on the president's behalf that he himself had privately opposed.

Yet in August 1968, the "Happy Warrior", as Humphrey had been nicknamed, arrived in Chicago for the Democratic convention depressed and demoralized, trailing his Republican opponent, Richard Nixon, in the polls by a whopping 16 points. The war had become a millstone around his neck, and yet Johnson had threatened to "destroy" his vice-president if he dared take a different line on Vietnam. When Humphrey in Chicago, as the official Democratic presidential nominee, tried to insert a compromise "peace" plank into the party's platform that seemed to satisfy both hawks and doves alike, the Democratic president called from his ranch in Texas to block him.

In the wake of that disastrous convention, where police brutally assaulted anti-war protesters on the streets of Chicago, the demonstrations against the hapless Humphrey intensified. "Dump the Hump" was on the gentler side; some protesters arrived at the VP's rallies with placards denouncing him as "Johnson's War Salesman" and a "Killer of Babies". One woman spat in his face.

"Let's face it, as of now we've lost," Humphrey's national campaign director, Larry O'Brien, told him a few weeks after Chicago. "Unless you change direction on this Vietnam thing and become your own man, you're finished."

On 30 September 1968, Humphrey finally became his "own man", committing "$100,000 of the campaign's dwindling funds to buy a half-hour on NBC television", and delivering a speech from a TV studio in Salt Lake City calling for an end to the war. In his address, Humphrey made clear that Johnson was still in charge of the effort to reach a peace deal in south-east Asia, but by 20 January 1969, there would "be a new president" and "if there is no peace by then" then there must be a "complete reassessment" of the conflict because "the policies of tomorrow need not be limited by the policies of yesterday".

The vice-president laid out a four-point plan to end the conflict. First, "a stopping of the bombing". Second, "a de-Americanization of the war". Third, an immediate "internationally supervised ceasefire". Fourth, "free elections", which he described as "the ultimate key to an honorable peace".

It was a powerful intervention from Humphrey, aired to tens of millions of Americans, which allowed the Democratic presidential candidate to hit reset with the party's base and, in particular, with younger voters and people of color. "He was a new man from then on," O'Brien later declaimed. "It was as if a burden had been lifted from his shoulders. And the impact on the campaign itself was just as great."

Humphrey experienced an immediate surge in the polls, narrowing the gap with Nixon. By election day, the final polls "pointed to a dead heat".

Few now remember that the 1968 presidential election, in terms of the popular vote, was super-close. Nixon defeated Humphrey by less than a percentage point, or about 500,000 votes. The question is: what if the Vietnam war hadn't dragged him down? What if he had been willing to break with Johnson over Vietnam much earlier than he did? Would the US have avoided Nixon, Watergate and the rest? Had he stood up to Johnson "over Vietnam in 1968", writes Humphrey's biographer Arnold Offner, "he might have won the presidential election".

The war, agrees Yale historian Michael Brenes, "alienated Humphrey from liberals, civil rights activists and young Americans - the same people who, for decades, had loved Humphrey for his support of racial justice, full employment and the labor movement - and ultimately cost him the presidency in 1968".

Has the 2024 Harris campaign learned any lessons from the 1968 Humphrey campaign?

To be clear: Gaza isn't Vietnam. There is no military draft and US troops are not bogged down in rice paddies 8,000 miles from home. And Harris, unlike Humphrey, is leading right now in most of the polls.

Complacency, however, would be a huge mistake for the Democrats. Harris, ideally, needs to maintain a sustained two-point lead over Trump to overcome the pro-Republican bias of our broken electoral college. Despite her clear momentum, she continues to struggle in the key swing state of Michigan, where "Uncommitted" voters are demanding a Gaza ceasefire paired with an arms embargo on Israel.

Agreeing to such a demand should be a moral, geopolitical, and - for the Democrats - electoral no-brainer. Gaza may not be Vietnam but Harris should, nonetheless, be distancing herself from Biden on Gaza in the same way that Humphrey distanced himself from Johnson on Vietnam. She should be advocating for all four of the steps that he advocated for in Salt Lake City, beginning with a call for an immediate halt to the horrific Israeli bombing of Gaza's schools, apartment buildings and refugee camps.

Crucially, however, she should do it more than a month before he did; she should do it in her acceptance speech to the Democratic national convention in Chicago on Thursday night. ("I fear she will be Humphrey and break too late," one prominent House Democrat texted me last week.)

What does she have to lose? As the Financial Times pointed out last month, the polling suggests there is "less downside" on Gaza than one might expect: "a Democrat who is soft on Israel (as Biden is seen as having been) loses support on the left, but a candidate who takes a more critical line wins those voters back without losing votes among moderates." A poll last week from YouGov and the Institute for Middle East Understanding (IMEU) showed over a third of voters in three swing states say they are more likely to vote for the Democratic nominee if they pledge to withhold weapons to Israel, while only 5 to 7% said they would be less likely to do so.

So what is Harris waiting for? More anti-war hecklers at her rallies? Even more civilian deaths caused by Biden administration-supplied munitions?

Some might say that it is impossible for a serving vice-president to go against the sitting president, even a deeply unpopular sitting president, on a major foreign policy issue. They would be wrong. Humphrey did it - he just did it too late in the campaign to reap an electoral advantage.

Harris is in a much stronger position than Humphrey. Biden would never dare try to humiliate her the way that Johnson regularly did to Humphrey. (On one memorable occasion, the then president insisted Humphrey continue reciting aloud from a draft speech of his on Vietnam as Johnson walked into a toilet: "Keep talking Hubert, I'm listening.")

Humphrey spent much of 1968 defending both Johnson and the war. He was less a candidate for change and "more like a son who feared a punitive father", to quote Offner. "I don't even know who Johnson would prefer as the next president," the fearful vice-president told the Soviet ambassador, Anatoly Dobrynin, "Nixon or me."

Harris is not Humphrey. Gaza is not Vietnam. 2024 is not 1968. Nevertheless, the similarities that do exist are too glaring to ignore.

Biden may want to continue sending more and more weapons to an Israeli government accused of war crimes at the international criminal court and of genocide at the international court of justice, but Harris should take a different stance - a bolder stance, a stance that is more in line with her party's base, as well as with the American public at large.

The current vice-president would do well to recall the words of the then vice-president after his narrow defeat in 1968. "I ought not to have let a man who was going to be a former president dictate my future."