Image copyright Getty Images Image caption Butterfield first served in Congress in 1995
Former southern Idaho Republican Congressman and three-term governor David Sutherland has announced he will not seek reelection in 2022.
David Sutherland – whose father Ben served in Congress for nearly five decades – was first elected in 1996.
The other Democrat in the race, G.K. Butterfield, said he will run for the seat he has held since 1995.
Mr Butterfield served as African-American congressman for North Carolina from 1993-95.
In his statement about not seeking reelection, Mr Sutherland said he wanted to “spend more time with my family and the church.”
He was married to Joyce Allred from 2001 to 2016. They have two daughters.
Image copyright Getty Images Image caption Both Mr Butterfield and Mr Sutherland have family ties to the auto industry
In June 2017, Mr Butterfield was convicted of corruption charges involving gifts he gave his daughter, which he was later released from prison and fined.
He had been initially charged with bribery and money laundering in July 2015 after pleading guilty to paying a former Ritchie County public official $1,200 (£1,082) in exchange for help obtaining a $500,000 (£378,710) construction loan from a county development authority in 2012.
Image copyright Getty Images Image caption David Sutherland served as governor of Idaho between 1999 and 2001
After his release from prison in February, Mr Butterfield, who was sentenced to 5 years and 8 months in prison, was made a good neighbour for free.
In August, the Democrat admitted to giving his daughter money but said he had thought it was legal.
He apologized to those who had been hurt.
Mr Butterfield then told the Associated Press news agency that the allegations had been “a lot of burden to carry”.
Former Appalachian mountain district Representative G.K. Butterfield also served as North Carolina state treasurer.
His father served on the House floor for 42 terms and died in 2014.
G.K. Butterfield became North Carolina’s first and only African-American federal lawmaker in Congress in 1993 when he was elected from the 18th district.
The former governor served as president of the Appalachian Mountain Club from 2001 to 2007.