Biden makes his supporters feel safe, but nominating him is risky.
A political party that does that deserves to lose, and as Goldberg notes, such parties often do lose!
Intensity — the thing that turns a campaign into a movement, that leads people to donate more than they can afford, host house parties and spend their free time knocking on the doors of strangers’ houses — matters. That’s especially true in a country as polarized as ours, where turnout is as important as persuasion. Ultimately, the paradox of primaries is that it’s most strategic to ignore the experts and follow your emotions.