Topical thread: Incumbency, retirements, and leavings

The Dan Rather interview also reminded me of the many Senators and House members outright retirements or “running for another office” that affect the nature of incumbent advantage in more regular elections. From a cursory google of sources I believe there are 9 senate retirements (4 R, 5D) and 17 (6R,11D) House members retiring outright, and the numbers sort of even out overall when those “seeking other offices” are added to the list.