He represents the 7th district, which covers parts of Lane County, including Junction City and northern Eugene.

Manning spent 24 years on active duty in the Army, and retired in 2007.

[2] Manning unsuccessfully ran for a seat in the Oregon House of Representatives in 2016, losing to Julie Fahey in the 14th district Democratic primary.

[3][4] He was appointed to the Senate in December 2016 in order to fill the seat vacated by Chris Edwards, who resigned from office.

[7] As a legislator, Manning supported efforts to expand automatic voter registration and create prepaid envelopes for Oregon residents to allow for mail-in voting.