Minnesota Gov. Mark Dayton announced the decision Wednesday. Smith's appointed term will last until January 2019.
Northam is currently the lieutenant governor and ran to continue incumbent Gov. Terry McAuliffe's policies.
After first saying she wasn't interested in the job, Colorado Lt. Gov. Donna Lynne has entered the race to be governor.
Colorado Lt. Gov. Donna Lynne has officially announced her campaign for governor in 2018.
A new Colorado lieutenant governor who took office Thursday says that efficiency will be her top job.
Health care executive Donna Lynne has been confirmed to be Colorado's next lieutenant governor.