OK, so as pointed out to me by Robbin Shipp, there have been at least 7 DNC chairs who also concurrently served as elected officials:
- Calvin Brice (1889 – 1892), also U.S. Senator from Ohio (1891-1897)
- James Kimbrough Jones (1896–1904), also U.S. Senator from Arkansas (1885-1903)
- Henry Jackson (1960-1961), also U.S. Senator from Washington (1953-1983)
- Fred Harris (1969-1970), also U.S. Senator from Oklahoma (1964-1973)
- Chris Dodd (1995-1997), also U.S. Senator from Connecticut (1981-2011)
- Tim Kaine (2009-2011), also Governor of Virginia (2006-2010)
- Debbie Wasserman Schultz (2011-2016), also Representative from Florida (2005-present)
Here are also some of the RNC’s chairs-cum-electeds:
- Bob Dole (1971-1973), also U.S. Senator from Kansas (1969-1996)
- Jim Gilmore (2001), also Governor of Virginia (1998-2002)
- Mel Martínez (2006-2007), also U.S. Senator from Florida (2005-2009)