So far, the impeachment inquiry into President Trump has featured few Republican voices of conscience. The closest is arguably Senator Mitt Romney of Utah. House Democrats missed an opportunity to add to the list when they didn’t ask any of the conservative legal experts appalled by Trump’s behavior to testify earlier this month.

So count me among those who hope House Democrats choose Justin Amash — the conservative Michigan congressman who recently switched from Republican to independent — to be one of their impeachment managers. Amash is evidently interested in the role, and several first-term House Democrats are pushing party leaders to select him.

If they do so, they would be giving a high-profile role in the Senate trial to a politician who can’t easily be portrayed as just another partisan Democrat. Trump and his enablers will still try to do so, of course. But Amash increases the chances that a small number of Trump supporters and swing voters might be persuaded.