He would have to caucus with one side or another, otherwise he would get no committee assignments. He would likely stick with Democrats, though, since Democrats ran no candidate against him and if he caucused with Republicans he would likely face a primary challenge for his next term regardless.
Never mind that some of these people polled think he might be related to Tom Osborn -
What would happen if Republicans get 50 seats, Democrats get 49 and the VP, and this guy refuses to caucus with either side?
He would have to caucus with one side or another, otherwise he would get no committee assignments. He would likely stick with Democrats, though, since Democrats ran no candidate against him and if he caucused with Republicans he would likely face a primary challenge for his next term regardless.
The VP only matters in case of a tie. If there aren’t 50 Dems or Senators who caucus with the Dems, they won’t control the Senate.