'The biggest wildcard for Harris’s nascent campaign is her leadership style.' (Julia Beverly/Getty Images)

In 2016, mainstream analysts were virtually certain that Donald Trump would not win the GOP nomination. Then, when he did, they claimed that it was nearly impossible that he would win the presidency. They were convinced they were able to see the future: a destiny where Democrats would indefinitely enjoy decisive electoral majorities. We know how that turned out.
These days, people are much more alive to the possibility that conventional wisdom might not apply to highly unconventional cases. This is good because, in many respects, the 2024 cycle is far more unusual than 2016.
This was true even when the race was still Trump versus Biden. It had been over a century since a former president last squared off against a sitting president (in 1912), and nearly 70 years since the last time two presidential candidates had a rematch. Both Trump and Biden were unprecedentedly old for presidential contenders, and other candidates were deeply unpopular. Everything, it seemed, was to play for.
However, even with Biden out of the running, this is still an extraordinarily unusual contest. Most obviously, substituting one’s candidate — as the Democrats did last month — is largely unheard of in US presidential contests. Precedents from abroad suggest that, because this is a tactic usually deployed by parties heading for certain defeat, candidate substitution typically improves a party’s performance, but not enough to change the overall outcome of the race. But sometimes — as in the case of Jacinta Ardern replacing the previous Labor Party candidate in New Zealand — it does flip the election.
It’s also unclear how to think about incumbency in this cycle. As a result of various psychological tendencies, incumbents are often strongly advantaged in electoral contests. However, this benefit does not seem to transfer to vice presidents or other chosen successors. In this race, then, Kamala Harris is not an incumbent.
But might Trump be? It’s hard to know. In previous cases where former presidents (Grover Cleveland, Teddy Roosevelt) have run for re-election after a spell out of the White House, they were running against direct incumbents — currently sitting presidents — so the advantage of their presidential experience likely washed out. In this case, Trump is running against someone who has never served in this role. Hence, if there is an incumbency advantage this cycle, it likely favours him. But Trump was the direct incumbent in 2020, and he lost anyway (the only time since 1980 that the winning party failed to stay in power for at least eight years).
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