Senators who dropped down to the House:
James Wolcott Wadsworth Jr (NY)
Claude Pepper (FL)
Garrett Withers (KY)
Matthew Neely (WV)*
Charles Towne (MN and NY)*
Hugh Mitchell (WA)
Magnus Johnson (MN)
Alton Lennon (NC)
Neely and Towne had previously served in the House before.
I'm assuming Harris is not resigning until January 20 so she can swear in Padilla herself. Biden resigned on this day eleven years ago so it was Cheney who swore in Ted Kaufman.
Walter Mondale resigned December 30, 1976 so he didn't get to swear in his successor either.
Neither Johnson nor Humphrey swore in their successors in the Senate either. Last VP to do so was Alben Barkley, who was Truman's VP. He resigned January 19 and Garrett Withers was sworn in as the senator from Kentucky the next day.
With a whopping 63% of people over 25 having at least a bachelor's degree, Mississippi Senate District 25 is the most educated senate district in the state. Though it remains solidly Republican for now, it has seen the same leftward drift.
The religiosity of southern college educated whites is what will keep them more Republican than their northern counterparts. While rural northern whites are starting to vote like they do in the south, it will take some time before he reverse happens.
If NC had a Senate race in 2018, Dems would have won it. Unfortunately for Dems the seats have been up in the wrong years. Dems will spend heavily on next year's race but they're underdogs with the lack of a top tier candidate and the state's partisanship.
Dems have exactly top tier officeholder and that's Roy Cooper. Since Dems failed to win the Lieutenant Governor's race, him running is completely out of the question.
State Senator Don Davis would be a strong candidate but him running is not going to happen. He'd never win a primary.