Here are some others:
-David Baria: ran for MS House after serving in MS Senate
-Pete Gallego: ran for TX Senate after serving in Congress
-Mike Michaud: ran for Board of Selectmen after serving in Congress
-Pat Quinn: ran for Attorney General after serving as Governor
-Jean Schmidt: ran for OH House after serving in Congress
-Matt Adamczyk: ran for WI House after serving as State Treasurer
-Ruth Johnson: ran for MI Senate after serving as Secretary of State
-Eliot Spitzer: ran for NYC Comptroller after serving as Governor
-David Young: ran for IA House after serving in Congress
-Larry Rhoden: ran for SD House after serving in SD Senate
-Dan Ahlers: ran for SD House after serving in SD Senate
-Roy Barnes: ran for GA House after serving in GA Senate
-Jackie Cilley: ran for NH House after serving in NH Senate
-David Rivera: ran for FL House after serving in Congress
-Anthony Brindisi: ran for NY Supreme Court after serving in Congress
-Evan Jenkins: ran for WV Supreme Court after serving in Congress
Jenkins really stands out on this list because most of the other people here, at least, were term-limited or had lost reelection or were out of office either way. Jenkins gave up a safe House seat that was his for as long as he wanted and chose to run for some obscure state-level position instead.