PiPress, here, noting, "St. Paul City Attorney Samuel Clark confirmed he is running."
A lot of names of attendees at the announcement event must mean something. The man seems well educated, (Harvard undergrad, Yale Law School), and if Harry Niska gets the GOP candidacy by endorsement or primary, there will be two bright candidates. Niska seems to pose churh-state possible difficulties, but would not be inept if winning in the 2018 general election. Political opinion here at Crabgrass is clearly in favor of the DFL when a good candidate exists (and then, there is Tom Baak/Bakk, whichever) so Samuel Clark is impressive, but so is the incumbent.