“Historically, the vice-president, in terms of the election, does not have any impact,” Donald Trump told the National Association of Black Journalists last week. “I mean, virtually no impact … virtually never has it mattered.” The former US president may have been engaged in a bit of wishful thinking. If the last few weeks have shown us anything, it’s that vice-presidential running mates do, in fact, matter. His, the Ohio senator JD Vance, has quickly become a centerpiece of the race, which has shifted to become in part a referendum on Vance’s regressive and hateful views of women.

The VP choice is not a superficial one, not merely an ornament to the presidential nominee or a bit of tactical cosmetic maneuvering to balance his or her weaknesses. A decision that is ultimately left entirely in the hands of the presidential nominee, it is a signal of that person’s perspectives and priorities, and one of the most influential choices he or she can make to shape the future of their party.

What sort of future for the Democratic party does Kamala Harris see in her choice of the Minnesota governor, Tim Walz? The move may reflect a shift away from the strategy of pivoting to the center that the Democrats have been pursuing for decades and towards a new policy and messaging strategy that seeks to attack the sadism and bigotry of Republicans and make an affirmative case for progressive values. Because frankly, if they were doing things the old way, they would have picked Josh Shapiro.