President Joe Biden’s decision to step aside as the Democratic nominee in this year’s presidential election certainly had a sense of inevitability about it.

Yet, it is still unprecedented in the modern era for a sitting president to drop out of a presidential race this late in the process. We are really in uncharted waters for American politics.

So, how where does the race go from here – and what does it mean for both the Democrats and Donald Trump, the Republican nominee?

Biden has endorsed his vice president, Kamala Harris, as the nominee, which I believe he was always going to do. Not anointing Harris as his successor would have been politically unthinkable for Biden simply because it would have undermined his own decision-making when he chose her to be his running mate before the 2020 election.

His endorsement will also have a big impact on the decision-making of the Democratic Party as a whole. Anybody who challenges Harris now might well be taking on the establishment of the party. And the party would be wary of increasing perceptions of disunity at this point.

So, it certainly seems the Democrats will unite behind her as the candidate.

That said, it’s not out of the realm of possibility that she could be challenged by another presidential hopeful. This may well depend on........

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