A few things are true about the Hunter Biden story. One is that there’s no evidence Joe Biden did what Donald Trump has accused him of doing: pressuring Ukraine to fire a prosecutor to protect his son from investigation.

But another is that Hunter Biden poses real problems for Joe Biden’s campaign, and if Democrats pretend otherwise, they’re making a mistake.

Many Democrats consider raising the Hunter Biden question unfair to Joe Biden. Why should he have to answer for the legal actions of his adult son? But no one said politics was fair. And if Democrats avoid the issue, they can be certain Trump will not. Biden’s vulnerability here needs to be tested in the primary, when Democrats have other choices, rather than in the general, when they won’t.