When U.S. senators leave Congress, they often transition to comfortable lives in the private sector or in retirement. Sometimes they’ll re-enter political life by trying to reclaim their Senate seats, running for governor or president or joining a presidential Cabinet.

Mike DeWine

But Mike DeWine , an Ohio Republican who served in the Senate from 1995 through 2006, is making a political comeback that is out of the ordinary: he’s running for state attorney general.

DeWine, who announced his candidacy Wednesday , has a long career in Ohio public life that also includes service as a county prosecutor, state senator, U.S. House member and lieutenant governor. Three years ago he lost his bid for a third Senate term to Democrat Sherrod Brown .  

DeWine’s unusual candidacy got me thinking: when has an ex-senator run for a *down-ballot* statewide office (lieutenant governor, attorney general, etc.)? I can’t think of any offhand, even after scanning this list of 150 living former senators .  

Use the comments section below if you can think of any.