Washington (CNN) The Ukraine revelations triggered a dramatic sea change on impeachment, as scores of Democrats stampeded to publicly declare their support for an impeachment inquiry.

In the aftermath of the Speaker Nancy Pelosi's September 24 announcement that formal impeachment proceedings would begin, nearly every remaining Democrat among the 235-member House caucus got on board the impeachment train.

All, that is, but seven.

So who are these seven holdouts? And more tellingly, where do they hail from and what do their districts tell us about why they might be holding their fire?

Geographically, they are spread out across the country, each from a different state.

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