Dick Cheney was an admission that George W. Bush thought he needed grownup help.
Sarah Palin was a recognition that without shaking up the race, John McCain couldn’t beat Barack Obama.
Joe Biden was a tacit assurance to voters that Obama wasn’t a radical and could work with the establishment.
Mike Pence was a blood-oath to white evangelicals, who were not yet fully on board the Trump train.
You get the picture.
So what does Kamala Harris tell us about how the Biden campaign sees the race right now?
Her selection suggests that the campaign believes their position is very strong.