What's Up with the Impeachment of the West Virginia Supreme Court (yes, the whole court)?

The West Virginia House this week voted to impeach the entire state supreme court. So what's up? Coverage here, NYT, WaPo (and here on the broader trend), and NYmag.com's Dailey Intelligencer.

This isn't the first time West Virginia's courts have been embroiled in constitutional/political disputes. We posted on Caperton here.